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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Apr. 01, 2017
Oct. 01, 2016
 [3]
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash $ 54,378 $ 65,759    
Cash and Cash Equivalents, Amortized Cost 340,167 392,410    
Cash and Cash Equivalents, Unrealized Gain 0 0    
Cash and Cash Equivalents, Unrealized Loss (16) 0    
Cash and Cash Equivalents, Estimated Fair Value 340,151 392,410    
Restricted Cash 535 [1] 530 [2]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost 340,702 392,940    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 340,686 392,940 $ 435,203 $ 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 (16) 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Estimated Fair Value 340,686 392,940    
Short term investments, available-for-sale(1) [4] 288,000 216,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 288,000 216,000    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost 628,702 608,940    
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 (16) 0    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Estimated Fair Value 628,686 608,940    
Money market funds        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 210,809 232,069    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss (16) 0    
Cash Equivalents, Estimated Fair Value 210,793 [5] 232,069 [2]    
Time deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 55,009 89,087    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 55,009 [1] 89,087 [2]    
Short term investments, available-for-sale(1) 192,000 120,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 192,000 [1] 120,000 [2]    
Commercial paper        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 19,971 5,495    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 19,971 [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 six months ended March 31, 2018 and April 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.