Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jul. 01, 2017
Assets:
Cash held in bank accounts	$ 88,300	$ 79,300
Recurring
Assets:
Total assets measured at fair value	234,831	178,282
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets measured at fair value	153,392	99,749
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Total assets measured at fair value	81,439	78,533
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Total assets measured at fair value	0	0
Commercial paper | Recurring
Assets:
Investments, Fair Value Disclosure	41,401	23,459
Commercial paper | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, Fair Value Disclosure	0	0
Commercial paper | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, Fair Value Disclosure	41,401	23,459
Commercial paper | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, Fair Value Disclosure	0	0
Corporate bonds | Recurring
Assets:
Investments, Fair Value Disclosure	4,100	10,094
Corporate bonds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, Fair Value Disclosure	0	0
Corporate bonds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, Fair Value Disclosure	4,100	10,094
Corporate bonds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, Fair Value Disclosure	0	0
U.S. Treasury securities | Recurring
Assets:
Investments, Fair Value Disclosure	31,939	4,006
U.S. Treasury securities | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments, Fair Value Disclosure	0	0
U.S. Treasury securities | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Investments, Fair Value Disclosure	31,939	4,006
U.S. Treasury securities | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Investments, Fair Value Disclosure	0	0
Money Market Funds | Recurring
Assets:
Cash and cash equivalents	153,392	99,037
Restricted cash, Money market funds		712
Money Market Funds | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	153,392	99,037
Restricted cash, Money market funds		712
Money Market Funds | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Restricted cash, Money market funds		0
Money Market Funds | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Restricted cash, Money market funds		0
Commercial Paper | Recurring
Assets:
Cash and cash equivalents	3,999	22,981
Commercial Paper | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	0	0
Commercial Paper | Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	3,999	22,981
Commercial Paper | Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$ 0	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