Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Summary of Goodwill and intangible assets
Intangibles, Gross amount	$ 61,232
Gross amount, Total	214,702	225,919
Intangibles, Accumulated amortization	0	0
Accumulated amortization, Total	(63,919)	(61,880)
Intangibles, Net	61,232
Intangibles, Net	7,000
Goodwill and intangible assets, Net Total	150,783	164,039
Goodwill (not subject to amortization) [Member]
Summary of Goodwill and intangible assets
Goodwill, Gross amount	1,001	4,000
Goodwill, Net	1,001	4,000
Trademarks and Tradenames (not subject to amortization) [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount		61,470
Intangibles, Net		61,470
Trademarks and Tradenames (subject to amortization) [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	13,915	13,971
Intangibles, Accumulated amortization	9,524	8,734
Intangibles, Net	4,391	5,237
Customer Relationships [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	107,671
Intangibles, Gross amount		115,520
Intangibles, Accumulated amortization	38,241	37,936
Intangibles, Net	69,430
Intangibles, Net		77,584
Technology [Member]
Summary of Goodwill and intangible assets
Intangibles, Gross amount	30,883
Intangibles, Gross amount		30,958
Intangibles, Accumulated amortization	16,154	15,210
Intangibles, Net	14,729
Intangibles, Net		$ 15,748