Significant Accounting Policies Cash and Cash Equivalents (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, customer funding	$ 579	$ 325
Compensating balance	302	296
Other Noncurrent Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Deposits restricted cash	13,000
Other Current Assets [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Deposits restricted cash	$ 13,665