Subsequent Event (Details) - USD ($)	Jan. 31, 2018	Dec. 30, 2017
Subsequent Event [Line Items]
Share repurchase program, amount approved		$ 200,000,000
Remaining amount available for share repurchases under stock repurchase program		$ 60,200,000
Subsequent Event
Subsequent Event [Line Items]
Share repurchase program, amount approved	$ 200,000,000