Accumulated Other Comprehensive Loss - Changes in Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,453,192	$ 1,364,781	$ 1,242,208
Change during the year	(3,641)	7,431	(4,536)
Balance at end of period	1,464,967	1,453,192	1,364,781
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(15,932)	(20,814)
Change during the year	(5,184)	4,882
Balance at end of period	(21,116)	(15,932)	(20,814)
Pension-related
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(5,477)	(8,251)
Change during the year	1,342	2,774
Balance at end of period	(4,135)	(5,477)	(8,251)
Derivative Financial Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(109)	116
Change during the year	201	(225)
Balance at end of period	92	(109)	116
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(21,518)	(28,949)	(24,413)
Change during the year	(3,641)	7,431
Balance at end of period	$ (25,159)	$ (21,518)	$ (28,949)