Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (31,425)	$ (28,796)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(14,388)	1,421
Other Comprehensive Income, Other, Net of Tax	1,874	692
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	12,514	(2,113)
Balance at the end of the period	(43,939)	(26,683)
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(10,272)	(12,132)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(6,386)	5,865
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	6,386	(5,865)
Balance at the end of the period	(16,658)	(6,267)
Deferred Income Taxes Related to Other Comprehensive Income	0
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(15,161)	(20,363)
Amounts reclassified out of AOCI	(163)	(167)
Other Comprehensive Income, Other, Net of Tax	163	167
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(163)	(167)
Balance at the end of the period	(14,998)	(20,196)
Accumulated tax expense (benefit)	2,000	2,300
Post-Retirement Benefit Plans
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	1,114	1,159
Amounts reclassified out of AOCI	42	40
Other Comprehensive Income, Other, Net of Tax	(42)	(40)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(42)	(40)
Balance at the end of the period	1,072	1,119
Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(6,739)	1,537
Amounts reclassified out of AOCI	5,384	932
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5,384	932
Balance at the end of the period	(12,123)	605
Forward Contracts [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(367)	1,003
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(2,618)	(3,512)
Amounts reclassified out of AOCI	1,753	565
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	865	2,947
Balance at the end of the period	$ (1,232)	$ (1,944)