Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 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)	991,683		1,861,632
Amount repurchased	$ 56.2		$ 106.3
Average repurchase price (in dollars per share)	$ 56.72		$ 57.10
Remaining authorized repurchase amount	$ 72.5		$ 72.5
2016 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount						$ 150.0
Amount repurchased (in shares)		512,943		671,409
Amount repurchased		$ 31.6		$ 41.2
Average repurchase price (in dollars per share)		$ 61.63		$ 61.30