Shareholders' Equity- Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period		$ (113,237)
Other comprehensive income (loss)		(2,818)	$ 1,101
Balance at the end of the period		(116,055)
Cumulative Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	[1]	(90,224)
Other comprehensive income (loss)		2,618
Balance at the end of the period	[1]	(87,606)
Defined Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period	[1]	(26,964)
Other comprehensive income (loss)		(714)
Balance at the end of the period	[1]	(27,678)
Deferred Hedging Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at the beginning of the period		3,951
Other comprehensive income (loss)		(4,722)
Balance at the end of the period		$ (771)

[1] Tax effect was not significant as of June 30 or March 31, 2015.