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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Jul. 01, 2017
Oct. 01, 2016
 [3]
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash $ 56,865 $ 65,759    
Cash and Cash Equivalents, Amortized Cost 362,691 392,410    
Cash and Cash Equivalents, Unrealized Gain 0 0    
Cash and Cash Equivalents, Unrealized Loss (5) 0    
Cash and Cash Equivalents, Estimated Fair Value 362,686 392,410    
Restricted Cash 514 [1] 530 [2]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost 363,205 392,940    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 363,200 392,940 $ 483,929 $ 423,907
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Gain 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Loss (5) 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Estimated Fair Value 363,200 392,940    
Short term investments, available-for-sale(1) [4] 258,000 216,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 258,000 216,000    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost 621,205 608,940    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Unrealized Gain 0 0    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Unrealized Loss (5) 0    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Estimated Fair Value 621,200 608,940    
Money market funds        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 196,844 232,069    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss (5) 0    
Cash Equivalents, Estimated Fair Value 196,839 [5] 232,069 [2]    
Time deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 89,017 89,087    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 89,017 [1] 89,087 [2]    
Short term investments, available-for-sale(1) 162,000 120,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 162,000 [1] 120,000 [2]    
Commercial paper        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 19,965 5,495    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 19,965 [1] 5,495 [2]    
Deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Short term investments, available-for-sale(1) 96,000 [6] 96,000 [7]    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value $ 96,000 [1],[6] $ 96,000 [2],[7]    
[1] Fair value approximates cost basis.
[2] Fair value approximates cost basis.
[3] * Certain time deposits as at October 1, 2016 have been corrected from cash equivalents to short-term investments for comparative purposes.
[4] All short-term investments were classified as available-for-sale and were measured at fair value based on level one measurement, or quoted market prices, as defined by ASC 820. The Company did not recognize any realized gains or losses on the sale of investments during the three and nine months ended June 30, 2018 and July 1, 2017.
[5] The fair value was determined using unadjusted prices in active, accessible markets for identical assets, and as such they were classified as Level 1 assets in the fair value hierarchy.
[6] Represents deposits that require a notice period of three months for withdrawal.
[7] Represents deposits that require a notice period of three months for withdrawal.