Revenue Recognition - Total Revenue Disaggregated by Service Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 23, 2019	Feb. 24, 2018	Feb. 23, 2019	Feb. 24, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 437,485	$ 419,264	$ 876,035	$ 835,042
Revenue | Revenues
Disaggregation of Revenue [Line Items]
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
Core Laundry Operations
Disaggregation of Revenue [Line Items]
Total revenues	$ 394,408	$ 378,955	$ 784,885	$ 752,751
Core Laundry Operations | Revenue | Revenues
Disaggregation of Revenue [Line Items]
Percentage of revenues	90.20%	90.40%	89.60%	90.20%
Specialty Garments
Disaggregation of Revenue [Line Items]
Total revenues	$ 29,745	$ 27,009	$ 64,193	$ 55,436
Specialty Garments | Revenue | Revenues
Disaggregation of Revenue [Line Items]
Percentage of revenues	6.80%	6.40%	7.30%	6.60%
First Aid
Disaggregation of Revenue [Line Items]
Total revenues	$ 13,332	$ 13,300	$ 26,957	$ 26,855
First Aid | Revenue | Revenues
Disaggregation of Revenue [Line Items]
Percentage of revenues	3.00%	3.20%	3.10%	3.20%