Fair Value Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Fair Value, Measurements, Recurring [Member] $ in Millions	6 Months Ended
	Apr. 01, 2016 USD ($)
Fair Value, Assets [Roll Forward]
Auction rate securities Beginning Balance	$ 2.3
Foreign currency derivative, Beginning Balance	3.3
Auction rate securities Ending Balance	2.3
Foreign currency derivative, Ending Balance	1.0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets [Roll Forward]
Auction rate securities Beginning Balance	2.3
Foreign currency derivative, Beginning Balance	3.3
Auction rate securities Ending Balance	2.3
Foreign currency derivative, Ending Balance	1.0
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member]
Fair Value, Assets [Roll Forward]
Auction rate securities Beginning Balance	2.3
Changes in fair value included in earnings	0.0
Auction rate securities Ending Balance	2.3
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
Fair Value, Assets [Roll Forward]
Foreign currency derivative, Beginning Balance	3.3
Changes in fair value included in earnings	(2.3)
Foreign currency derivative, Ending Balance	$ 1.0