Additional Consolidated Balance Sheets Information Level 4 (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Mar. 31, 2013
Employee-related Liabilities	$ 20,391	$ 12,078
Accrued Vacation	7,159	6,739
Accrued Bonuses	9,954	22,342
Accrued Liabilities for Commissions, Expense and Taxes	8,391	9,656
Other Postretirement Benefits Payable	3,271	3,271
Pension and Other Postretirement and Postemployment Benefit Plans, Liabilities	195	230
Employee-related Liabilities, Current	49,361	54,316
Deferred Revenue	37,126	40,422
Self Insurance Reserve, Current	3,356	3,726
Accrued Sales Commission	8,684	8,545
Product Warranty Accrual	8,795	12,734
Accrued Liabilities	68,981	85,147
Self Insurance Reserve, Noncurrent	11,552	11,552
Other Postretirement Benefits Payable, Noncurrent	19,247	21,278
Defined Benefit Pension Plan, Liabilities, Noncurrent	5,846	6,890
Pension and Other Postretirement and Postemployment Benefit Plans, Liabilities, Noncurrent	5,963	5,349
Accrued Income Taxes, Noncurrent	0	9,670
Other Liabilities	3,447	3,339
Other Accrued Liabilities	11,020	19,720
Other Liabilities, Noncurrent	$ 46,055	$ 58,078