Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Feb. 29, 2020	Feb. 23, 2019	Feb. 29, 2020	Feb. 23, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		$ 1,676,008	$ 1,539,498	$ 1,641,230	$ 1,464,967
Other comprehensive income (loss)		(397)	1,347	587	(847)
Balance at end of period		1,701,438	1,580,790	1,701,438	1,580,790
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		(23,651)	(23,398)	(24,640)	(21,116)
Other comprehensive income (loss) before reclassification		(769)	1,418	220	(864)
Amounts reclassified from accumulated other comprehensive loss		0	0	0	0
Other comprehensive income (loss)		(769)	1,418	220	(864)
Balance at end of period		(24,420)	(21,980)	(24,420)	(21,980)
Pension-related
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	[1]	(9,239)	(4,135)	(9,239)	(4,135)
Other comprehensive income (loss) before reclassification	[1]	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	[1]	350	0	350	0
Other comprehensive income (loss)	[1]	350	0	350	0
Balance at end of period	[1]	(8,889)	(4,135)	(8,889)	(4,135)
Derivative Financial Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	[1]	186	180	191	92
Other comprehensive income (loss) before reclassification	[1]	52	(39)	77	93
Amounts reclassified from accumulated other comprehensive loss	[1]	(30)	(32)	(60)	(76)
Other comprehensive income (loss)	[1]	22	(71)	17	17
Balance at end of period	[1]	208	109	208	109
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		(32,704)	(27,353)	(33,688)	(25,159)
Other comprehensive income (loss) before reclassification		(717)	1,379	297	(771)
Amounts reclassified from accumulated other comprehensive loss		320	(32)	290	(76)
Other comprehensive income (loss)		(397)	1,347	587	(847)
Balance at end of period		$ (33,101)	$ (26,006)	$ (33,101)	$ (26,006)

[1] Amounts are shown net of tax.