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Inventories - Additional Information (Detail) - USD ($)
3 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 30, 2019
Inventory [Line Items]      
Slow moving and obsolete inventory reserve $ 4,700,000   $ 4,467,000
Three to Four Years Old Inventory [Member]      
Inventory [Line Items]      
Cost basis reduction in inventory, percentage   50.00%  
Inventory, minimum time period on the shelf, years   0 years  
Inventory, maximum time period on the shelf, years   4 years  
Four to Five Years Old Inventory [Member]      
Inventory [Line Items]      
Cost basis reduction in inventory, percentage   75.00%  
Inventory, minimum time period on the shelf, years   0 years  
Inventory, maximum time period on the shelf, years   5 years  
Greater Than Five Years Old Inventory [Member]      
Inventory [Line Items]      
Inventory, minimum time period on the shelf, years   5 years  
Inventory valuation estimate   $ 0  
Provisions on obsolescence   $ 0  
Inventory Valuation Adjustment [Member]      
Inventory [Line Items]      
Cumulative impact of change in accounting method inventory $ 2,708,000