Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Pension Plans, Net of Tax
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (14,831)	$ (14,998)
Other comprehensive income (loss) before reclassifications		0
Amounts reclassified out of AOCI	39	144
Other comprehensive income (loss)	39	144
Balance at the end of the period	(14,792)	(14,854)
Accumulated tax expense (benefit)	2,300	2,700
Foreign Exchange Contracts
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	1,154	2,907
Other comprehensive income (loss) before reclassifications	(3,795)	(107)
Amounts reclassified out of AOCI	(643)	1,059
Other comprehensive income (loss)	(4,438)	952
Balance at the end of the period	(3,284)	3,859
Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	285	(5,299)
Other comprehensive income (loss) before reclassifications	(11)	5,573
Other comprehensive income (loss)	(11)	5,573
Balance at the end of the period	274	274
Post-Retirement Benefit Plan Adjustments
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	879	1,134
Amounts reclassified out of AOCI	(39)	(47)
Other comprehensive income (loss)	(39)	(47)
Balance at the end of the period	840	1,087
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	9,715	(25,556)
Other comprehensive income (loss) before reclassifications	(24,203)	4,353
Other comprehensive income (loss)	(24,203)	4,353
Balance at the end of the period	(14,488)	(21,203)
Net Accumulated Other Comprehensive Income (Loss) (2)
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(2,798)	(41,812)
Other comprehensive income (loss) before reclassifications	(28,009)	9,819
Amounts reclassified out of AOCI	(643)	1,156
Other comprehensive income (loss)	(28,652)	10,975
Balance at the end of the period	$ (31,450)	$ (30,837)