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Net Gain on Sale of Property, Plant and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 03, 2017
Sep. 03, 2017
Property Plant and Equipment Useful Life and Values [Abstract]    
Proceeds from sale of facility $ 1,231,000 $ 420,000
Gain (loss) on disposal of asset $ 762,000 $ (60,000)