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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Oct. 01, 2016
 [1]
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash $ 85,663 $ 65,759    
Cash and Cash Equivalents, Amortized Cost 390,672 392,410    
Cash and Cash Equivalents, Unrealized Gain 0 0    
Cash and Cash Equivalents, Unrealized Loss (11) 0    
Cash and Cash Equivalents, Estimated Fair Value 390,661 392,410    
Restricted Cash 528 530    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost 391,200 392,940    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 391,189 392,940 $ 453,426 $ 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 (11) 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Estimated Fair Value 391,189 392,940    
Short term investments, available-for-sale(1) [2] 259,000 216,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 259,000 216,000    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost 650,200 608,940    
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 (11) 0    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Estimated Fair Value 650,189 608,940    
Money market funds        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 230,029 232,069    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss (11) 0    
Cash Equivalents, Estimated Fair Value 230,018 232,069    
Time deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 55,006 89,087    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 55,006 89,087    
Short term investments, available-for-sale(1) 163,000 120,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 163,000 120,000    
Commercial paper        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 19,974 5,495    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 19,974 5,495    
Deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Short term investments, available-for-sale(1) 96,000 96,000    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value $ 96,000 $ 96,000    
[1] * Certain time deposits as at October 1, 2016 were previously reclassified from cash equivalents to short-term investments for comparative purposes.
[2] 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. As of December 30, 2017 and September 30, 2017, fair value approximated the cost basis for short-term investments. The Company did not recognize any realized gains or losses on the sale of investments during the three months ended December 30, 2017 and December 31, 2016.