v3.3.0.814
Product Warranties - Activity in Product Warranty Reserves (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 26, 2015
Guarantees [Abstract]    
Balance at beginning of period $ 1,335,000 $ 1,245,000
Warranty charges 408,980 1,170,875
Warranty payments (373,980) (1,045,875)
Balance at end of period $ 1,370,000 $ 1,370,000