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Accounts Receivable - Net (Details) (USD $)
 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Jun. 30, 2013
Fenco [Member]
May 31, 2013
Fenco [Member]
Accounts Receivable - Net [Abstract]          
Accounts receivable - trade $ 37,545,000   $ 40,686,000    
Allowance for bad debts (1,084,000)   (1,019,000)    
Customer allowances earned (10,524,000)   (11,160,000)    
Customer payment discrepancies (518,000)   (514,000)    
Customer returns RGA issued (4,809,000)   (4,966,000)    
Customer core returns accruals (20,681,000)   (19,338,000)    
Less: total accounts receivable offset accounts (37,616,000)   (36,997,000)    
Total accounts receivable - net (71,000) [1]   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 4,377,000
Warranty Returns [Abstract]          
Warranty accrual included in customer returns RGA issued 1,688,000        
Warranty accrual included in customer finished goods returns accrual 3,614,000        
Warranty return accrual, deconsolidated       5,642,000  
Change in warranty return accrual [Roll Forward]          
Balance at beginning of period 6,205,000 4,426,000      
Charged to expense 11,368,000 11,747,000      
Amounts processed (12,271,000) (11,486,000)      
Balance at end of period $ 5,302,000 $ 4,687,000      
[1] Accounts receivable—net has been reclassified and included in accrued liabilities in the consolidated balance sheet at June 30, 2013.