Note 14 - Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Feb. 25, 2017	Feb. 27, 2016	Feb. 25, 2017	Feb. 27, 2016
Beginning Balance				$ 1,364,781
Ending Balance		$ 1,417,396		1,417,396
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning Balance		(25,943)	$ (21,995)	(20,814)	$ (20,423)
Other comprehensive income (loss) before reclassification		3,332	(2,011)	(1,797)	(3,583)
Amounts reclassified from accumulated other comprehensive (loss) income
Net current period other comprehensive income (loss)		3,332	(2,011)	(1,797)	(3,583)
Ending Balance		(22,611)	(24,006)	(22,611)	(24,006)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Beginning Balance	[1]	(8,251)	(4,937)	(8,251)	(4,719)
Other comprehensive income (loss) before reclassification	[1]				(261)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]				43
Net current period other comprehensive income (loss)	[1]				(218)
Ending Balance	[1]	(8,251)	(4,937)	(8,251)	(4,937)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Beginning Balance	[1]	364	434	116	729
Other comprehensive income (loss) before reclassification	[1]	(202)	175	122	(48)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	(27)	(93)	(103)	(165)
Net current period other comprehensive income (loss)	[1]	(229)	82	19	(213)
Ending Balance	[1]	135	516	135	516
AOCI Attributable to Parent [Member]
Beginning Balance		(33,830)	(26,498)	(28,949)	(24,413)
Other comprehensive income (loss) before reclassification		3,130	(1,836)	(1,675)	(3,892)
Amounts reclassified from accumulated other comprehensive (loss) income		(27)	(93)	(103)	(122)
Net current period other comprehensive income (loss)		3,103	(1,929)	(1,778)	(4,014)
Ending Balance		$ (30,727)	$ (28,427)	$ (30,727)	$ (28,427)

[1] Amounts are shown net of tax