Accumulated Other Comprehensive Loss - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 26, 2017	Aug. 27, 2016	Aug. 29, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,364,781	$ 1,242,208	$ 1,134,459
Change during the year	7,431	(4,536)	(21,880)
Balance at end of period	1,453,192	1,364,781	1,242,208
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(20,814)	(20,423)
Change during the year	4,882	(391)
Balance at end of period	(15,932)	(20,814)	(20,423)
Pension-related
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(8,251)	(4,719)
Change during the year	2,774	(3,532)
Balance at end of period	(5,477)	(8,251)	(4,719)
Derivative Financial Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	116	729
Change during the year	(225)	(613)
Balance at end of period	(109)	116	729
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(28,949)	(24,413)	(2,533)
Balance at end of period	$ (21,518)	$ (28,949)	$ (24,413)