Stock Repurchase and Dividends (Details) - USD ($) $ / shares in Units, $ in Millions							12 Months Ended
	Nov. 07, 2016	Jul. 25, 2016	Apr. 25, 2016	Jan. 25, 2016	Nov. 09, 2015	Nov. 10, 2014	Oct. 02, 2016	Sep. 27, 2015
Maximum repurchase amount under stock repurchase program						$ 200.0
Period of stock repurchase program						2 years
Shares repurchased through open market purchases							3,468,062
Average price of shares repurchased (in dollars per share)							$ 28.69
Cost of shares repurchased							$ 99.5
Quarterly cash dividend declared (in dollars per share)		$ 0.09	$ 0.09	$ 0.08	$ 0.08
Payment of dividends							$ 19.7	$ 18.2
Subsequent Events
Maximum repurchase amount under stock repurchase program	$ 200.0
Quarterly cash dividend declared (in dollars per share)	$ 0.09