Income Taxes - Narrative (Details)		3 Months Ended		9 Months Ended		12 Months Ended
		Jul. 07, 2019	Jul. 08, 2018	Jul. 07, 2019	Jul. 08, 2018	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense at statutory rate (percent)		25.80%	28.60%	25.80%	28.90%	24.50%
Effective Income Tax Rate Reconciliation, Percent	[1]	(17.90%)	26.50%	18.40%	46.90%

[1] Percentages may not add due to rounding.