Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014
Changes in goodwill
Goodwill, net, balance at the beginning of the period	$ 127,934
Goodwill, net, balance at the end of the period	127,934
Other intangible assets, net:
Other intangible assets, net, balance at beginning of the period	91,411
Purchase of intangible assets	12,472
Amortization expense	(6,194)
Changes in foreign currency exchange rates	(1,671)
Other intangible assets, net, balance at end of the period	$ 96,018