Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Feb. 14, 2018	Jun. 06, 2016
2016 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount						$ 150.0
Amount repurchased (in shares)	947,685	189,891	1,619,094	457,702
Amount repurchased	$ 56.7	$ 10.0	$ 97.8	$ 23.9
Average repurchase price (in dollars per share)	$ 59.81	$ 52.40	$ 60.43	$ 52.12
Remaining Authorized Repurchase Amount	$ 18.0		$ 18.0
2018 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount					$ 200.0