Goodwill and Intangibles (Details1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	$ 36,754	$ 36,754	$ 36,790
Accumulated Amortization	7,894	7,065	6,237
Tradenames and trademarks[Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	12,793	12,793	12,793
Accumulated Amortization	0	0	0
Customer relationships [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	22,057	22,057	22,057
Accumulated Amortization	7,109	6,358	5,608
Non-compete [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	200	200	200
Accumulated Amortization	200	200	192
Trademarks [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	403	403	403
Accumulated Amortization	228	213	198
Patents [Member]
Gross carrying value of intangible assets and accumulated amortization
Gross Carrying Amount	1,301	1,301	1,337
Accumulated Amortization	$ 357	$ 294	$ 239