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Accounts Receivable - Net (Details) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2013
May 31, 2013
Fenco [Member]
Accounts Receivable - Net [Abstract]            
Accounts receivable - trade $ 45,454,000   $ 45,454,000   $ 40,686,000  
Allowance for bad debts (993,000)   (993,000)   (1,019,000)  
Customer allowances earned (10,876,000)   (10,876,000)   (11,160,000)  
Customer payment discrepancies (471,000)   (471,000)   (514,000)  
Customer returns RGA issued (8,589,000)   (8,589,000)   (4,966,000)  
Customer core returns accruals (23,246,000)   (23,246,000)   (19,338,000)  
Less: total accounts receivable offset accounts (44,175,000)   (44,175,000)   (36,997,000)  
Total accounts receivable - net 1,279,000   1,279,000   3,689,000  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Accounts receivable - net, deconsolidated           4,377,000
Warranty Returns [Abstract]            
Warranty accrual included in customer returns RGA issued 4,091,000   4,091,000      
Warranty accrual included in customer finished goods returns accrual 3,113,000   3,113,000      
Warranty return accrual, deconsolidated           5,642,000
Change in warranty return accrual [Roll Forward]            
Balance at beginning of period 5,302,000 4,687,000 6,205,000 4,426,000    
Charged to expense 17,357,000 13,868,000 28,725,000 25,615,000    
Amounts processed (15,455,000) (13,070,000) (27,726,000) (24,556,000)    
Balance at end of period $ 7,204,000 $ 5,485,000 $ 7,204,000 $ 5,485,000