Income Taxes (Summary of Deferred Tax Assets and Liabilities, and Classification in the Consolidated Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Deferred tax assets:
Operating loss and tax credit carry-forwards	$ 289,895	$ 259,657
Compensation reserves	66,709	64,628
Environmental reserves	9,235	9,446
Sales Returns	8,281	8,753
Other	11,837	26,069
Valuation allowance	(242,735)	(103,539)
Deferred tax assets, net	143,222	265,014
Deferred tax liabilities:
Property, plant and equipment	(11,151)	(32,022)
Foreign exchange	(76)	(4,880)
Intangible assets	(38,552)	(39,865)
Deferred tax liabilities	(49,779)	(76,767)
Net deferred tax assets	93,443	188,247
Classification of deferred tax assets, net
Current asset	11,470	30,804
Deferred Tax Liabilities, Net, Current	(8,721)	0
Noncurrent asset	107,865	174,601
Noncurrent liability	$ (17,171)	$ (17,158)