Fair Value (Tables)

6 Months Ended

Apr. 01, 2016

Fair Value Disclosures [Abstract]

Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis

As of April 1, 2016, assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):         

	As of April 1, 2016								As of October 2, 2015
			Fair Value Measurements								Fair Value Measurements
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Assets
Money market funds	$	498.3	$	498.3	$	—	$	—	$	464.6	$	464.6	$	—	$	—
Auction rate security	2.3		—		—		2.3		2.3		—		—		2.3
Foreign currency derivative assets	1.0		—		—		1.0		3.3		—		—		3.3
Total	$	501.6	$	498.3	$	—	$	3.3	$	470.2	$	464.6	$	—	$	5.6
Liabilities
Purchase obligation recorded for business combinations	$	76.1	$	—	$	—	$	76.1	$	75.4	$	—	$	—	$	75.4
Foreign currency derivative liabilities	0.6		—		—		0.6		2.8		—		—		2.8
Contingent consideration liability recorded for business combinations	0.5		—		—		0.5		0.5		—		—		0.5
Total	$	77.2	$	—	$	—	$	77.2	$	78.7	$	—	$	—	$	78.7

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following table summarizes changes to the fair value of the Level 3 assets (in millions):

	Auction rate security		Foreign currency derivative
Balance as of October 2, 2015	$	2.3	$	3.3
Changes in fair value included in earnings	—		(2.3		)
Balance as of April 1, 2016	$	2.3	$	1.0

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table summarizes changes to the fair value of the Level 3 liabilities (in millions):

	Purchase obligation		Foreign currency derivative			Contingent consideration
Balance as of October 2, 2015	$	75.4	$	2.8		$	0.5
Changes in fair value included in earnings	0.7		(2.2		)	—
Balance as of April 1, 2016	$	76.1	$	0.6		$	0.5