Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Aug. 28, 2021	Aug. 29, 2020
Deferred Tax Assets
Payroll and benefit related	$ 21,893	$ 17,451
Insurance related	14,042	13,790
Environmental	8,408	7,856
Accrued expenses	10,134	6,270
Operating lease liabilities	9,214	8,720
Other	8,127	7,536
Total deferred tax assets	71,818	61,623
Deferred Tax Liabilities
Payroll and benefit related	19,474	17,722
Tax in excess of book depreciation	40,725	41,713
Purchased intangible assets	36,183	32,892
Rental merchandise in service	45,432	38,846
Operating lease right-of-use assets	8,984	8,952
Other	157	191
Total deferred tax liabilities	150,955	140,316
Net deferred tax liability	$ 79,137	$ 78,693