Summary of Activity in Target PSP Shares Granted Under Equity Incentive Plan (Details) - Performance Shares - shares	11 Months Ended	12 Months Ended
	Oct. 02, 2015	Sep. 29, 2017	Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-vested, beginning of year	0	89,275	34,700
Granted	36,800	43,650	56,275
Vested	0	0	0
Forfeited/cancelled	(2,100)	(12,775)	(1,700)
Non-vested, end of year	34,700	120,150	89,275