Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jul. 01, 2017	Jul. 02, 2016
Assets:
Cash held in bank accounts	$ 79,300	$ 70,900
Recurring
Assets:
Total assets measured at fair value	178,282	25,716
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets measured at fair value	99,749	25,716
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Total assets measured at fair value	78,533	0
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Total assets measured at fair value	0	0
Commercial paper | Recurring
Assets:
Investments, Fair Value Disclosure	23,459
Commercial paper | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, Fair Value Disclosure	0
Commercial paper | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, Fair Value Disclosure	23,459
Commercial paper | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, Fair Value Disclosure	0
Corporate bonds | Recurring
Assets:
Investments, Fair Value Disclosure	10,094
Corporate bonds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, Fair Value Disclosure	0
Corporate bonds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, Fair Value Disclosure	10,094
Corporate bonds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, Fair Value Disclosure	0
U.S. Treasury securities | Recurring
Assets:
Investments, Fair Value Disclosure	4,006
U.S. Treasury securities | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, Fair Value Disclosure	0
U.S. Treasury securities | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, Fair Value Disclosure	4,006
U.S. Treasury securities | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, Fair Value Disclosure	0
Money Market Funds | Recurring
Assets:
Cash and cash equivalents	99,037	25,004
Restricted cash, Money market funds	712	712
Money Market Funds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	99,037	25,004
Restricted cash, Money market funds	712	712
Money Market Funds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Restricted cash, Money market funds	0	0
Money Market Funds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Restricted cash, Money market funds	0	$ 0
Commercial Paper | Recurring
Assets:
Cash and cash equivalents	22,981
Commercial Paper | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	0
Commercial Paper | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	22,981
Commercial Paper | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0
Corporate Bonds | Recurring
Assets:
Cash and cash equivalents	2,012
Corporate Bonds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	0
Corporate Bonds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	2,012
Corporate Bonds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0
US agency securities | Recurring
Assets:
Cash and cash equivalents	15,981
US agency securities | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	0
US agency securities | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	15,981
US agency securities | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$ 0