Goodwill And Intangible Asset Impairment Tax Benefit

Name:	lts_GoodwillAndIntangibleAssetImpairmentTaxBenefit
Namespace Prefix:	lts
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Income Taxes [Line Items]

Name:	lts_IncomeTaxesLineItems
Namespace Prefix:	lts
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration