Note 4 - Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Nov. 26, 2016	Aug. 27, 2016
Cash equivalents	$ 173,725	$ 172,760
Pension plan assets	4,534	4,753
Foreign currency forward contracts	593	188
Total assets at fair value	178,852	177,701
Fair Value, Inputs, Level 1 [Member]
Cash equivalents	173,725	172,760
Pension plan assets
Foreign currency forward contracts
Total assets at fair value	173,725	172,760
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Pension plan assets	4,534	4,753
Foreign currency forward contracts	593	188
Total assets at fair value	$ 5,127	$ 4,941