Earnings Per Share - Narrative (Details) - $ / shares shares in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 24, 2017	Jun. 30, 2018	Jun. 24, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of options to purchase common stock outstanding (in shares)	2.4	2.7	2.4	2.7
Common stock outstanding, not included in computation of diluted earnings per share (in shares)	0.6	0.6	0.6	0.6
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase common stock (in dollars per share)	$ 6.43	$ 6.43	$ 6.43	$ 6.43
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase common stock (in dollars per share)	$ 38.10	$ 31.76	$ 38.10	$ 31.76