Note 9 - Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Feb. 25, 2017	Aug. 27, 2016
Gross Carrying Amount	$ 240,191	$ 196,787
Accumulated Amortization	164,304	158,123
Net Carrying Amount	75,887	38,664
Customer Contracts [Member]
Gross Carrying Amount	206,258	165,405
Accumulated Amortization	135,137	129,551
Net Carrying Amount	71,121	35,854
Other Intangible Assets [Member]
Gross Carrying Amount	33,933	31,382
Accumulated Amortization	29,167	28,572
Net Carrying Amount	$ 4,766	$ 2,810