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Auction Rate Securities - ARS Investments (Detail) - USD ($) $ in Millions | Jun. 27, 2015 | Jun. 28, 2014
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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.

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