Quarterly report pursuant to Section 13 or 15(d)

Restructuring Narrative (Details)

v2.4.1.9
Restructuring Narrative (Details) (USD $)
3 Months Ended 9 Months Ended 15 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 302,000us-gaap_RestructuringCharges $ 0us-gaap_RestructuringCharges $ 1,400,000us-gaap_RestructuringCharges $ 4,524,000us-gaap_RestructuringCharges
Termination benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 238,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
  2,700,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
2,726,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Leases and other contractual obligations        
Restructuring Cost and Reserve [Line Items]        
Area of closed facility (in sq ft) 11,000ent_RestructuringandRelatedCostsAreaofClosedFacility
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
  11,000ent_RestructuringandRelatedCostsAreaofClosedFacility
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
11,000ent_RestructuringandRelatedCostsAreaofClosedFacility
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Percentage of company square footage being closed 6.00%ent_RestructuringandRelatedCostsPercentageofCompanySquareFootageBeingClosed
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
  6.00%ent_RestructuringandRelatedCostsPercentageofCompanySquareFootageBeingClosed
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
6.00%ent_RestructuringandRelatedCostsPercentageofCompanySquareFootageBeingClosed
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Restructuring charges 64,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
  400,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
386,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Minimum        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring charge 4,700,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  4,700,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
4,700,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Expected legal and professional fees associated with restructuring plan to be incurred periodically 1,500,000ent_RestructuringandRelatedCostsExpectedLegalandProfessionalFeesAssociatedwithRestructuringPlan
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  1,500,000ent_RestructuringandRelatedCostsExpectedLegalandProfessionalFeesAssociatedwithRestructuringPlan
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
1,500,000ent_RestructuringandRelatedCostsExpectedLegalandProfessionalFeesAssociatedwithRestructuringPlan
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum        
Restructuring Cost and Reserve [Line Items]        
Expected restructuring charge 5,200,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  5,200,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
5,200,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Expected legal and professional fees associated with restructuring plan to be incurred periodically $ 2,000,000ent_RestructuringandRelatedCostsExpectedLegalandProfessionalFeesAssociatedwithRestructuringPlan
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  $ 2,000,000ent_RestructuringandRelatedCostsExpectedLegalandProfessionalFeesAssociatedwithRestructuringPlan
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 2,000,000ent_RestructuringandRelatedCostsExpectedLegalandProfessionalFeesAssociatedwithRestructuringPlan
/ us-gaap_RangeAxis
= us-gaap_MaximumMember