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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Cash, Cash Equivalents and Marketable Securities) (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 27, 2024
Jun. 28, 2024
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash and cash equivalents $ 145,498   $ 145,498 $ 111,854  
Proceeds from maturities of short-term investments     27,025 0 $ 0
Investments purchased   $ 2,218 2,218 40,696 0
Unrealized gain (loss) on available-for-sale securities, net of tax     0 0 0
Short-term investments 16,541   16,541 26,764  
Long-term investments 0   0 13,943  
Contractual accounts receivable 44,192   44,192 44,066  
Allowance for credit losses 3,543   3,543 907  
Goodwill impairment 11,173   11,173 0 0
Goodwill 0   0 $ 11,172 $ 11,160
Non-US          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cash and cash equivalents $ 62,134   $ 62,134