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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Deferred tax assets:    
Accounts receivable $ 1,204 $ 660
Inventories 6,146 4,345
Net operating loss carryforwards 60,359 67,834
Accrued expenses 58,417 32,773
Other assets 13,291 9,703
Gross deferred tax assets 139,417 115,315
Less valuation allowance (23,583) (54,542)
Total deferred tax assets 115,834 60,773
Deferred tax liabilities:    
Property, plant and equipment 26,286 28,985
Other intangible assets 71,094 48,142
Convertible Notes 22,687 22,386
Other liabilities 1,554 865
Total deferred tax liabilities 121,621 100,378
Net deferred tax liabilities $ (5,787) $ (39,605)