Fair Value (Tables)

12 Months Ended

Oct. 02, 2015

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

ssets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):     

	As of October 2, 2015								As of October 3, 2014
			Fair Value Measurements								Fair Value Measurements
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Assets
Money market funds	$	464.6	$	464.6	$	—	$	—	$	444.5	$	444.5	$	—	$	—
Auction rate security	2.3		—		—		2.3		2.3		—		—		2.3
Foreign currency derivative assets	3.3		—		—		3.3		0.7		—		—		0.7
Total	$	470.2	$	464.6	$	—	$	5.6	$	447.5	$	444.5	$	—	$	3.0
Liabilities
Purchase obligation recorded for business combinations	$	75.4	$	—	$	—	$	75.4	$	74.0	$	—	$	—	$	74.0
Foreign currency derivative liabilities	2.8		—		—		2.8		0.7		—		—		0.7
Contingent consideration liability recorded for business combinations	0.5		—		—		0.5		—		—		—		—
Total	$	78.7	$	—	$	—	$	78.7	$	74.7	$	—	$	—	$	74.7

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 3, 2014	$	2.3	$	0.7
Changes in fair value included in earnings	—		2.6
Balance as of October 2, 2015	$	2.3	$	3.3

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 3, 2014	$	74.0	$	0.7	$	—
Changes in fair value included in earnings	1.4		2.1		—
Purchases and additions	—		—		0.5
Balance as of October 2, 2015	$	75.4	$	2.8	$	0.5