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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash $ 53,793 $ 42,446    
Cash and Cash Equivalents, Amortized Cost 277,426 320,635    
Cash and Cash Equivalents, Unrealized Gain 0 0    
Cash and Cash Equivalents, Unrealized Loss 0 5    
Cash and Cash Equivalents, Estimated Fair Value 277,426 320,630    
Restricted Cash 516 [1] 518 [2]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost 277,942 321,153    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 277,942 321,148 $ 391,189 $ 392,940
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Gain 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Unrealized Loss 0 5    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Estimated Fair Value 277,942 321,148    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 355,000 293,000    
Short-term Investments [3] 355,000 293,000    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost 632,942 614,153    
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 0 5    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Estimated Fair Value 632,942 614,148    
Money market funds        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 153,617 209,172    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 5    
Cash Equivalents, Estimated Fair Value 153,617 [4] 209,167 [5]    
Time deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 70,016 69,017    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 70,016 [1] 69,017 [2]    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 256,000 [1] 197,000 [5]    
Short-term Investments 256,000 197,000    
Deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 99,000 [1],[6] 96,000 [5],[7]    
Short-term Investments $ 99,000 [6] $ 96,000 [7]    
[1] Fair value approximates cost basis.
[2] Fair value approximates cost basis.
[3] 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 months ended December 29, 2018 and December 30, 2017.
[4] 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.
[5] (in thousands)AmortizedCost UnrealizedGains UnrealizedLosses EstimatedFair ValueCurrent assets: Cash$42,446 $— $— $42,446Cash equivalents: Money market funds (1)209,172 — (5) 209,167Time deposits (2)69,017 — — 69,017Total cash and cash equivalents$320,635 $— $(5) $320,630Restricted Cash (2)518 — — 518Total cash, cash equivalents, and restricted cash$321,153 $— $(5) $321,148Short-term investments (2): Time deposits 197,000 — — 197,000Deposits (3)96,000 — — 96,000Total short-term investments$293,000 $— $— $293,000Total cash, cash equivalents, restricted cash and short-term investments$614,153 $— $(5) $614,148
[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.