Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) (Details)

v3.3.1.900
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), net of tax, beginning balance $ 311,761  
Accumulated other comprehensive income (loss), net of tax, ending balance 297,509  
Foreign currency translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), net of tax, beginning balance (21,956) $ (13,765)
Other comprehensive income (loss) before reclassifications (2,955) (2,957)
Amounts reclassified from accumulated other comprehensive loss to net income   0
Accumulated other comprehensive income (loss), net of tax, ending balance (24,911) (16,722)
Defined benefit pension plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), net of tax, beginning balance (1,022) (934)
Other comprehensive income (loss) before reclassifications 93 31
Amounts reclassified from accumulated other comprehensive loss to net income   10
Accumulated other comprehensive income (loss), net of tax, ending balance (929) (893)
AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated other comprehensive income (loss), net of tax, beginning balance (22,978) (14,699)
Other comprehensive income (loss) before reclassifications (2,862) (2,926)
Amounts reclassified from accumulated other comprehensive loss to net income   10
Accumulated other comprehensive income (loss), net of tax, ending balance $ (25,840) $ (17,615)