Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income (Loss) From Continuing Operations Before Income Taxes (Details)

v2.4.1.9
Income Taxes - Income (Loss) From Continuing Operations Before Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Components of Income (Loss) From Continuing Operations Before Income Taxes [Line Items]      
U.S. $ 22,493us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (6,315)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 4,951us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Non-U.S. 40,069us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 39,078us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 36,358us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income from continuing operations 62,562thr_IncomeLossFromContinuingOperationsBeforeIncomeTaxes 32,763thr_IncomeLossFromContinuingOperationsBeforeIncomeTaxes 41,550thr_IncomeLossFromContinuingOperationsBeforeIncomeTaxes
Scenario, Previously Reported [Member]      
Components of Income (Loss) From Continuing Operations Before Income Taxes [Line Items]      
Non-U.S. $ 40,069us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
$ 39,078us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
$ 36,599us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember