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Inventories (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Aug. 31, 2013
Inventory Disclosure [Abstract]      
Inventory, gross $ 144,709 $ 144,148  
LIFO inventory amount 135,300 137,700  
FIFO Towables inventory amount 8,400 6,400  
Increase to LIFO reserves $ 1,244 $ 1,456 $ (1,180)