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FAIR VALUE MEASUREMENTS - Condensed Consolidated Balance Sheet (Details) - Fair value, Measurements, Recurring - USD ($)
$ in Thousands
Jul. 31, 2021
Oct. 31, 2020
Assets:    
Total assets measured at fair value $ 1,279,279 $ 1,180,842
Liabilities:    
Total liabilities measured at fair value 24,391 29,194
Cash equivalents    
Assets:    
Cash equivalents 1,015,403 939,654
Short-term investments    
Assets:    
Short-term investments 182,010 150,667
Prepaid expenses and other    
Assets:    
Other assets 8,598 82
Long-term investments    
Assets:    
Long-term investments 60,888  
Other long-term assets    
Assets:    
Other assets 12,380 90,439
Accrued liabilities and other short-term obligations    
Liabilities:    
Accrued liabilities and other short-term obligations 3,709 681
Other long-term obligations    
Liabilities:    
Other long-term obligations 20,682 28,513
Level 1    
Assets:    
Total assets measured at fair value 1,027,783 947,867
Liabilities:    
Total liabilities measured at fair value 0 0
Level 1 | Cash equivalents    
Assets:    
Cash equivalents 1,015,403 939,654
Level 1 | Short-term investments    
Assets:    
Short-term investments 0 0
Level 1 | Prepaid expenses and other    
Assets:    
Other assets 0 0
Level 1 | Long-term investments    
Assets:    
Long-term investments 0  
Level 1 | Other long-term assets    
Assets:    
Other assets 12,380 8,213
Level 1 | Accrued liabilities and other short-term obligations    
Liabilities:    
Accrued liabilities and other short-term obligations 0 0
Level 1 | Other long-term obligations    
Liabilities:    
Other long-term obligations 0 0
Level 2    
Assets:    
Total assets measured at fair value 251,496 232,975
Liabilities:    
Total liabilities measured at fair value 24,391 29,194
Level 2 | Cash equivalents    
Assets:    
Cash equivalents 0 0
Level 2 | Short-term investments    
Assets:    
Short-term investments 182,010 150,667
Level 2 | Prepaid expenses and other    
Assets:    
Other assets 8,598 82
Level 2 | Long-term investments    
Assets:    
Long-term investments 60,888  
Level 2 | Other long-term assets    
Assets:    
Other assets 0 82,226
Level 2 | Accrued liabilities and other short-term obligations    
Liabilities:    
Accrued liabilities and other short-term obligations 3,709 681
Level 2 | Other long-term obligations    
Liabilities:    
Other long-term obligations 20,682 28,513
Level 3    
Assets:    
Total assets measured at fair value 0 0
Liabilities:    
Total liabilities measured at fair value 0 0
Level 3 | Cash equivalents    
Assets:    
Cash equivalents 0 0
Level 3 | Short-term investments    
Assets:    
Short-term investments 0 0
Level 3 | Prepaid expenses and other    
Assets:    
Other assets 0 0
Level 3 | Long-term investments    
Assets:    
Long-term investments 0  
Level 3 | Other long-term assets    
Assets:    
Other assets 0 0
Level 3 | Accrued liabilities and other short-term obligations    
Liabilities:    
Accrued liabilities and other short-term obligations 0 0
Level 3 | Other long-term obligations    
Liabilities:    
Other long-term obligations $ 0 $ 0