Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Feb. 23, 2019	Feb. 24, 2018		Feb. 23, 2019	Feb. 24, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		$ 1,539,498	$ 1,485,608		$ 1,464,967	$ 1,453,192
Other comprehensive income (loss)		1,347	45		(847)	(1,882)
Balance at end of period		1,580,790	1,544,401		1,580,790	1,544,401
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		(23,398)	(17,945)		(21,116)	(15,932)
Other comprehensive (loss) income before reclassification		1,418	1,250		(864)	(763)
Amounts reclassified from accumulated other comprehensive loss		0	0		0	0
Other comprehensive income (loss)		1,418	1,250		(864)	(763)
Balance at end of period		(21,980)	(16,695)		(21,980)	(16,695)
Pension-related
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	[1]	(4,135)	(5,477)	[2]	(4,135)	(5,477)	[2]
Other comprehensive (loss) income before reclassification	[1]	0	0		0	0
Amounts reclassified from accumulated other comprehensive loss	[1]	0	(1,192)	[2]	0	(1,192)	[2]
Other comprehensive income (loss)	[1]	0	(1,192)	[2]	0	(1,192)	[2]
Balance at end of period	[1]	(4,135)	(6,669)	[2]	(4,135)	(6,669)	[2]
Derivative Financial Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	[1]	180	(23)		92	(109)
Other comprehensive (loss) income before reclassification	[1]	(39)	(23)		93	59
Amounts reclassified from accumulated other comprehensive loss	[1]	(32)	10		(76)	14
Other comprehensive income (loss)	[1]	(71)	(13)		17	73
Balance at end of period	[1]	109	(36)		109	(36)
Total Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		(27,353)	(23,445)		(25,159)	(21,518)
Other comprehensive (loss) income before reclassification		1,379	1,227		(771)	(704)
Amounts reclassified from accumulated other comprehensive loss		(32)	(1,182)		(76)	(1,178)
Other comprehensive income (loss)		1,347	45		(847)	(1,882)
Balance at end of period		$ (26,006)	$ (23,400)		$ (26,006)	$ (23,400)

[1] Amounts are shown net of tax.

[2] Activity represents the impact of the adoption of ASU 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”.