Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Aug. 29, 2020	Aug. 31, 2019
Deferred Tax Assets
Payroll and benefit related	$ 17,451	$ 15,929
Insurance related	13,790	11,948
Environmental	7,856	7,093
Accrued expenses	6,270	2,164
Operating lease liabilities	8,720
Other	7,536	7,301
Total deferred tax assets	61,623	44,435
Deferred Tax Liabilities
Payroll and benefit related	17,722	16,056
Tax in excess of book depreciation	41,713	42,691
Purchased intangible assets	32,892	29,633
Rental merchandise in service	38,846	46,649
Operating lease right-of-use assets	8,952
Other	191	290
Total deferred tax liabilities	140,316	135,319
Net deferred tax liability	$ 78,693	$ 90,884