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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Jun. 29, 2019
Sep. 29, 2018
Jun. 30, 2018
Sep. 30, 2017
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash $ 261,806 $ 42,446    
Cash and Cash Equivalents, Amortized Cost 395,538 320,635    
Cash and Cash Equivalents, Unrealized Gain 0 0    
Cash and Cash Equivalents, Unrealized Loss 0 (5)    
Cash and Cash Equivalents, Estimated Fair Value 395,538 320,630    
Restricted Cash 474 [1] 518 [2]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Amortized Cost 396,012 321,153    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 396,012 321,148 $ 363,200 $ 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 396,012 321,148    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 248,000 293,000    
Short-term investments [3] 248,000 293,000    
Cash, Cash Equivalents, Restricted Cash, Restricted Cash Equivalents, and Short-Term Investments, Amortized Cost 644,012 614,153    
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 644,012 614,148    
Money market funds        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 123,726 209,172    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 (5)    
Cash Equivalents, Estimated Fair Value 123,726 [4] 209,167 [5]    
Time deposits        
Cash, Cash Equivalents, Restricted Cash and Short-Term Investments [Line Items]        
Cash Equivalents, Amortized Cost 10,006 69,017    
Cash Equivalents, Unrealized Gain 0 0    
Cash Equivalents, Unrealized Loss 0 0    
Cash Equivalents, Estimated Fair Value 10,006 [1] 69,017 [2]    
Short-term Investments, Unrealized Gain 0 0    
Short-term Investments, Unrealized Loss 0 0    
Short-term Investments, Estimated Fair Value 149,000 [1] 197,000 [5]    
Short-term investments 149,000 197,000    
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 [2],[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 and nine months ended June 29, 2019 and June 30, 2018.
[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]
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.