Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Feb. 24, 2018	Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
Income Tax Disclosure [Abstract]
Estimated income taxes net benefit		$ 22,600
Estimated tax transition charge		2,500
Tax benefit		3,100
Provisional net benefit	$ 20,100	$ 20,100
Blended federal statutory income tax rate		25.90%	35.00%	35.00%
Unrecognized tax benefits		$ 2,198	$ 4,214	$ 3,743
Total unrecognized tax benefits		1,900	3,600
Accrued interest and penalties		$ 100	$ 100