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Warranty - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Warranties [Line Items]                
Warranty reserves related to continuing operations $ 361,000 $ 695,000 $ 361,000 $ 695,000 $ 585,000 $ 526,000 $ 678,000 $ 688,000
Warranty expense $ 79,000 $ 271,000 $ 236,000 $ 499,000