Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 25, 2018	May 26, 2018	Feb. 24, 2018	Nov. 25, 2017	Aug. 26, 2017	May 27, 2017	Feb. 25, 2017	Nov. 26, 2016	Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
Segment Reporting Information [Line Items]
Revenues	$ 434,063	$ 427,384	$ 419,264	$ 415,778	$ 403,589	$ 409,834	$ 391,427	$ 386,108	$ 1,696,489	$ 1,590,958	$ 1,468,046
Income (loss) from operations									182,376	110,283	201,160
Interest income, net									(5,543)	(4,269)	(2,543)
Income before income taxes	42,853	$ 47,792	$ 43,568	$ 53,033	(7,677)	$ 39,362	$ 37,374	$ 46,064	187,246	115,123	203,371
Depreciation and amortization									96,662	88,879	81,612
Capital expenditures									112,747	108,554	98,235
Total assets	1,843,386				1,819,128				1,843,386	1,819,128	1,702,007
US and Canadian Rental and Cleaning | Operating Segments
Segment Reporting Information [Line Items]
Revenues									1,485,548	1,415,423	1,308,152
Income (loss) from operations									213,322	200,585	201,148
Interest income, net									(3,927)	(3,371)	(3,252)
Income before income taxes									217,252	204,108	204,433
Depreciation and amortization									64,481	59,899	57,062
Capital expenditures									105,481	104,984	91,384
Total assets	1,670,713				1,667,540				1,670,713	1,667,540	1,567,943
MFG | Operating Segments
Segment Reporting Information [Line Items]
Revenues									247,530	206,572	189,154
Income (loss) from operations									89,035	76,115	67,385
Interest income, net									0	0	0
Income before income taxes									88,856	75,738	67,407
Depreciation and amortization									2,238	2,185	2,073
Capital expenditures									2,882	1,079	1,598
Total assets	33,622				34,045				33,622	34,045	32,556
MFG | Net Interco MFG Elim
Segment Reporting Information [Line Items]
Revenues									(247,424)	(206,316)	(188,904)
Income (loss) from operations									(9,658)	(3,415)	(711)
Interest income, net									0	0	0
Income before income taxes									(9,658)	(3,415)	(711)
Depreciation and amortization									0	0	0
Capital expenditures									0	0	0
Total assets	0				0				0	0	0
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Revenues									37,994	26,470	20,973
Income (loss) from operations									(129,111)	(176,978)	(81,748)
Interest income, net									(1,616)	(898)	709
Income before income taxes									(127,510)	(175,595)	(82,714)
Depreciation and amortization									24,108	20,866	16,918
Capital expenditures									0	0	0
Total assets	0				0				0	0	0
Subtotal Core Laundry Operations
Segment Reporting Information [Line Items]
Revenues									1,523,648	1,442,149	1,329,375
Income (loss) from operations									163,588	96,307	186,074
Interest income, net									(5,543)	(4,269)	(2,543)
Income before income taxes									168,940	100,836	188,415
Depreciation and amortization									90,827	82,950	76,053
Capital expenditures									108,363	106,063	92,982
Total assets	1,704,335				1,701,585				1,704,335	1,701,585	1,600,499
Specialty Garments | Operating Segments
Segment Reporting Information [Line Items]
Revenues									118,477	98,024	91,257
Income (loss) from operations									14,070	9,018	10,204
Interest income, net									0		0
Income before income taxes									13,589	9,329	10,074
Depreciation and amortization									4,244	4,429	4,332
Capital expenditures									3,781	1,737	4,682
Total assets	110,811				87,767				110,811	87,767	77,728
First Aid | Operating Segments
Segment Reporting Information [Line Items]
Revenues									54,364	50,785	47,414
Income (loss) from operations									4,718	4,958	4,882
Interest income, net									0	0	0
Income before income taxes									4,717	4,958	4,882
Depreciation and amortization									1,591	1,500	1,227
Capital expenditures									603	754	571
Total assets	$ 28,240				$ 29,776				$ 28,240	$ 29,776	$ 23,780