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Auction Rate Securities - ARS Investments (Detail) - USD ($)
$ in Millions
Jun. 27, 2015
Jun. 28, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 384.2 $ 450.9
Total available-for-sale securities 392.1 459.5
Auction Rate Securities Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 19.1 24.0
Other-than- temporary Impairment in Retained Earnings (11.2) (12.8)
Amortized Cost 7.9 11.2
Unrealized Gain/(Loss) 7.9 8.6
Total available-for-sale securities 15.8 19.8
Auction Rate Securities Investments [Member] | Student Loans [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis   3.5
Other-than- temporary Impairment in Retained Earnings   (0.2)
Amortized Cost   3.3
Unrealized Gain/(Loss)   (0.1)
Total available-for-sale securities   3.2
Auction Rate Securities Investments [Member] | Credit Linked Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 13.5 13.5
Other-than- temporary Impairment in Retained Earnings (6.1) [1] (7.5) [2]
Amortized Cost 7.4 6.0
Unrealized Gain/(Loss) 5.0 5.9
Total available-for-sale securities 12.4 11.9
Auction Rate Securities Investments [Member] | Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 5.0 5.0
Other-than- temporary Impairment in Retained Earnings (5.0) (5.0)
Unrealized Gain/(Loss) 2.8 2.8
Total available-for-sale securities 2.8 2.8
Auction Rate Securities Investments [Member] | Municipals [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 0.6 2.0
Other-than- temporary Impairment in Retained Earnings (0.1) (0.1)
Amortized Cost 0.5 1.9
Unrealized Gain/(Loss) 0.1  
Total available-for-sale securities $ 0.6 $ 1.9
[1] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $2.7 million on non-current other assets. Accretion is reclassified from accumulated other comprehensive income and recorded in the consolidated statements of income as interest income.
[2] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $1.3 million on non-current other assets. Accretion is reclassified from accumulated other comprehensive income and recorded in the consolidated statements of income as interest income.