FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jul. 01, 2017	Apr. 01, 2017	Jul. 02, 2016
Short-term Investments [Abstract]
Cash held in bank accounts, excluded	$ 179,969	$ 219,270	$ 214,063	$ 95,929
Money market funds
Short-term Investments [Abstract]
Cash held in bank accounts, excluded	64,573	99,037
Commercial paper
Short-term Investments [Abstract]
Cash held in bank accounts, excluded	23,967	22,981
Cash-in-bank
Short-term Investments [Abstract]
Cash held in bank accounts, excluded	91,429	79,259
Fair Value, Measurements, Recurring
Short-term Investments [Abstract]
Total assets measured at fair value	212,973	178,282
Fair Value, Measurements, Recurring | Commercial paper
Short-term Investments [Abstract]
Short-term investments	58,461	23,459
Fair Value, Measurements, Recurring | US Treasury securities
Short-term Investments [Abstract]
Short-term investments	55,833	4,006
Fair Value, Measurements, Recurring | Corporate bonds
Short-term Investments [Abstract]
Short-term investments	10,139	10,094
Fair Value, Measurements, Recurring | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	64,573	99,037
Restricted cash:
Restricted cash		712
Fair Value, Measurements, Recurring | Commercial paper
Cash and cash equivalents:
Cash and cash equivalents	23,967	22,981
Fair Value, Measurements, Recurring | U.S. agency securities
Cash and cash equivalents:
Cash and cash equivalents		15,981
Fair Value, Measurements, Recurring | Corporate bonds
Cash and cash equivalents:
Cash and cash equivalents		2,012
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Short-term Investments [Abstract]
Total assets measured at fair value	64,573	99,749
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Cash and cash equivalents:
Cash and cash equivalents	64,573	99,037
Restricted cash:
Restricted cash		712
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Short-term Investments [Abstract]
Total assets measured at fair value	148,400	78,533
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper
Short-term Investments [Abstract]
Short-term investments	58,461	23,459
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | US Treasury securities
Short-term Investments [Abstract]
Short-term investments	55,833	4,006
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds
Short-term Investments [Abstract]
Short-term investments	10,139	10,094
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper
Cash and cash equivalents:
Cash and cash equivalents	$ 23,967	22,981
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency securities
Cash and cash equivalents:
Cash and cash equivalents		15,981
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds
Cash and cash equivalents:
Cash and cash equivalents		$ 2,012