Basis of Presentation and Preparation - Fiscal Year (Details)	12 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016
Principles of Consolidation and Presentation
Number of weeks in a fiscal year, low end of range	364 days
Number of weeks in a fiscal year, high end of range	371 days
Number of weeks in a fiscal year	364 days	364 days	371 days