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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Sep. 26, 2015
Dec. 27, 2014
Inventory Disclosure [Abstract]    
Bulk product $ 75,548 $ 65,603
Finished product 116,863 105,117
Packaging materials 2,839 2,803
Total $ 195,250 $ 173,523