Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Summary of Goodwill and intangible assets
Gross amount, Total	$ 209,012	$ 204,735
Accumulated amortization, Total	(64,203)	(59,425)
Intangibles, Net	6,700
Goodwill and intangible assets, Net Total	144,809	145,310
Goodwill (not subject to amortization) [Member]
Summary of Goodwill and intangible assets
Goodwill, Gross amount	880	1,014
Goodwill, Net	880	1,014
Trademarks and Tradenames (not subject to amortization) [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	61,132	60,105
Intangibles, Net	61,132	60,105
Trademarks and Tradenames Subject to Amortization [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	13,905	13,671
Intangibles, Accumulated amortization	(10,341)	(9,627)
Intangibles, Net	3,564	4,044
Customer Relationships [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	107,252	104,534
Intangibles, Accumulated amortization	(41,824)	(38,591)
Intangibles, Net	65,428	65,943
Technology [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	25,843	25,411
Intangibles, Accumulated amortization	(12,038)	(11,207)
Intangibles, Net	$ 13,805	$ 14,204