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Auction Rate Securities - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 27, 2015 | Jun. 28, 2014 | Jun. 29, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Auction Rate Securities with fair value maturing from 2016 to 2018 | $ 13.1 |  |
Auction rate securities with fair value having no stated maturity | 2.7 |  |
ARS investments, investment grade | 0.6 |  |
ARS investments, below investment grade | $ 18.5 |  |
Minimum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Maturity period one | 2016 |  |
Maximum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Maturity period one | 2018 |  |
Auction Rate Securities Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
ARS investments redeemed at par | $ 4.9 | $ 0.0 | $ 3.4
ARS investments, current | $ 0.6 |  |
ARS investments current, maturity date | Jul. 01, 2015 |  |

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