Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 25, 2018
Deferred Tax Assets
Payroll and benefit related	$ 15,929	$ 14,718
Insurance related	11,948	10,880
Environmental	7,093	6,593
Accrued expenses	2,164	3,513
Other	7,301	7,440
Total deferred tax assets	44,435	43,144
Deferred Tax Liabilities
Payroll and benefit related	16,056	0
Tax in excess of book depreciation	42,691	39,877
Purchased intangible assets	29,633	27,206
Rental merchandise in service	46,649	44,508
Other	290	318
Total deferred tax liabilities	135,319	111,909
Net deferred tax liability	$ 90,884	$ 68,765