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Auction Rate Securities - ARS Investments (Detail) - USD ($)
$ in Millions
Jun. 25, 2016
Jun. 27, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 324.4 $ 384.2
Fair Value 327.7 392.1
Auction Rate Securities Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 12.5 19.1
Other-than- temporary Impairment in Retained Earnings (7.2) (11.2)
Amortized Cost 5.3 7.9
Unrealized Gain 3.3 7.9
Fair Value 8.6 15.8
Auction Rate Securities Investments [Member] | Credit Linked Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis 7.5 13.5
Other-than- temporary Impairment in Retained Earnings (2.2) [1] (6.1) [2]
Amortized Cost 5.3 7.4
Unrealized Gain 1.8 5.0
Fair Value 7.1 12.4
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 1.5 2.8
Fair Value $ 1.5 2.8
Auction Rate Securities Investments [Member] | Municipals [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Original Cost Basis   0.6
Other-than- temporary Impairment in Retained Earnings   (0.1)
Amortized Cost   0.5
Unrealized Gain   0.1
Fair Value   $ 0.6
[1] Other-than-temporary impairment in retained earnings is partially offset by cumulative accretion of $4.4 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 $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.