Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Feb. 14, 2018	Jun. 06, 2016
2018 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount					$ 200.0
Amount repurchased (in shares)	784,493		2,646,125
Amount repurchased	$ 44.4		$ 150.7
Average repurchase price (in dollars per share)	$ 56.61		$ 56.95
Remaining authorized repurchase amount	$ 28.1		$ 28.1
2016 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount						$ 150.0
Amount repurchased (in shares)		947,685		1,619,094
Amount repurchased		$ 56.7		$ 97.8
Average repurchase price (in dollars per share)		$ 59.81		$ 60.43