Debts and Letters of Credit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified			0 Months Ended	6 Months Ended						6 Months Ended			0 Months Ended	3 Months Ended			6 Months Ended				6 Months Ended
	Dec. 29, 2012 letter	Jun. 30, 2012	Jan. 20, 2012 Revolving Credit Facility	Dec. 29, 2012 Revolving Credit Facility	Dec. 29, 2012 Revolving Credit Facility Alternate base rate	Dec. 29, 2012 Revolving Credit Facility Adjusted LIBOR rate	Dec. 29, 2012 Maximum Revolving Credit Facility	Dec. 29, 2012 Maximum Revolving Credit Facility Alternate base rate	Dec. 29, 2012 Maximum Revolving Credit Facility Adjusted LIBOR rate	Dec. 29, 2012 Minimum Revolving Credit Facility	Dec. 29, 2012 Minimum Revolving Credit Facility Alternate base rate	Dec. 29, 2012 Minimum Revolving Credit Facility Adjusted LIBOR rate	Jun. 30, 2006 1% senior convertible notes	Dec. 29, 2012 1% senior convertible notes	Sep. 29, 2012 1% senior convertible notes	Dec. 31, 2011 1% senior convertible notes	Dec. 29, 2012 1% senior convertible notes item	Dec. 31, 2011 1% senior convertible notes	Jun. 30, 2012 1% senior convertible notes	Jun. 05, 2006 1% senior convertible notes	Dec. 29, 2012 1% senior convertible notes Maximum
Debt details
Convertible Debt														$ 205.6			$ 205.6		$ 292.8
Short-term debt	205.6	292.8
Interest rate on Senior convertible notes (as a percent)														1.00%		1.00%	1.00%	1.00%		1.00%
Aggregate principal amount of convertible debt																				425.0
Proceeds from issuance of convertible notes after issuance costs																				415.9
Conversion price of convertible debt (in dollars per share)														$ 30.30			$ 30.30
Percentage of principal amount that the holder of the note may require the entity to repurchase the debt instrument on May 15, 2013, 2016, and 2021														100.00%			100.00%
Percentage of principal amount that the holder of the note may require the entity to repurchase due to certain fundamental changes undergone by the entity																	100.00%
Percentage of principal amount at which the entity may redeem some or all of the notes on or after May 20, 2013																	100.00%
Discount rate used to calculate the carrying value of the liability component of the convertible debt (as a percent)																				8.10%
Variable rate basis on which discount rate is based					Base rate	LIBOR							7-year swap
Carrying value of the liability component of convertible debt																				266.5
Carrying value of the equity component of convertible debt																				158.5
Remaining term of convertible notes																					1 year
Deferred finance costs				1.9																9.1
Liability component, debt issuance cost																				5.7
Equity component, debt issuance cost																				3.4
Principal amount of debt repurchased														50.0	50.0
Cash paid for repurchase of debt														49.9	49.8
Debt instruments repurchased																	2
Losses on repurchase of Convertible Notes														1.3	2.1
Carrying amounts of the liability and equity components:
Carrying amount of equity component, net of equity issuance cost														156.8			156.8		158.3
Principal amount of 1% senior convertible note														211.0			211.0		311.0
Unamortized discount of liability component														(5.4)			(5.4)		(18.2)
Fair market value of convertible debt														210.5			210.5		307.3
Fair value of the bond parity derivatives														0			0		0
Effective interest rate and interest expense for the contractual interest and the accretion of debt discount:
Effective interest rate (as a percent)														8.10%		8.10%	8.10%	8.10%
Interest expense-contractual interest														0.5		0.8	1.2	1.6
Accretion of debt discount														3.6		5.0	7.8	9.9
Credit facility term			5 years
Maximum borrowing capacity under the credit agreement			250.0
Potential additional borrowings allocated as either an increase to the revolving loan commitments or as an add-on term loan				100
Percentage points added to the reference rate								2.00%	3.00%		0.75%	1.75%
Commitment fee on the unused portion of the credit facility (as a percent)							0.50%			0.25%
Minimum cash and permitted investments agreed to be maintained under the terms of revolving credit facility				200
Period of amortization of debt issuance costs capitalized				5 years
Outstanding balance				0
Unamortized portion of debt issuance cost				1.5										0.2			0.2
Outstanding Letters of Credit
Number of standby letters of credit	15
Letters of credit outstanding	$ 34.5