Annual report pursuant to Section 13 and 15(d)

Schedule II Valuation and Qualifying Accounts (Details)

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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Mar. 31, 2013
Allowance for Doubtful Accounts [Member]
Mar. 31, 2012
Allowance for Doubtful Accounts [Member]
Mar. 31, 2011
Allowance for Doubtful Accounts [Member]
Mar. 31, 2013
Inventory Valuation Reserve [Member]
Mar. 31, 2012
Inventory Valuation Reserve [Member]
Mar. 31, 2011
Inventory Valuation Reserve [Member]
Mar. 31, 2013
Valuation Allowance of Deferred Tax Assets [Member]
Mar. 31, 2012
Valuation Allowance of Deferred Tax Assets [Member]
Mar. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]
Mar. 31, 2013
Allowance for Sales Returns [Member]
Mar. 31, 2012
Allowance for Sales Returns [Member]
Mar. 31, 2011
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]                          
Valuation Allowances and Reserves,Beginning Balance   $ 12 $ 147 $ 237 $ 1,479 $ 1,551 $ 1,691 $ 2,253 $ 527 $ 61,297 $ 13 $ 7 $ 15
Valuation Allowances and Reserves, Adjustments     (61)     (57)              
Valuation Allowances and Reserves, Charged to Cost and Expense 545 (2) (79) (34) 1,090 816 1,157       218 98 94
Valuation Allowances and Reserves, Additions (Deductions)     5 [1] (56) [1] (537) [2] (831) [2] (1,297) [2] 34,032 [3] 1,726 [3] (60,770) [3] (212) (92) (102)
Valuation Allowances and Reserves, Ending Balance     $ 12 $ 147 $ 2,032 $ 1,479 $ 1,551 $ 36,285 $ 2,253 $ 527 $ 19 $ 13 $ 7
[1] Accounts written off, net of recoveries.
[2] Inventory charged against inventory reserves.
[3] Change in valuation allowance due to change in assessment of realizability of deferred tax assets.