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MARKETABLE SECURITIES - Schedule of Underlying Maturities of AFS Securities (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Available-for-sale securities  
Due in one year or less, Cost $ 428,534
Due in one year or less, Fair Value 428,711
Due after one year through five years, Cost 512,953
Due after one year through five years, Fair Value 512,909
Marketable securities | U.S. government agency securities  
Available-for-sale securities  
Due in one year or less, Cost 7,049
Due in one year or less, Fair Value 7,067
Due after one year through five years, Cost 269,097
Due after one year through five years, Fair Value 269,014
Marketable securities | Corporate bonds  
Available-for-sale securities  
Due in one year or less, Cost 235,977
Due in one year or less, Fair Value 236,101
Due after one year through five years, Cost 132,685
Due after one year through five years, Fair Value 132,731
Marketable securities | Certificates of deposit  
Available-for-sale securities  
Due in one year or less, Cost 175,508
Due in one year or less, Fair Value 175,542
Due after one year through five years, Cost 0
Due after one year through five years, Fair Value 0
Marketable securities | Asset backed securities  
Available-for-sale securities  
Due in one year or less, Cost 0
Due in one year or less, Fair Value 0
Due after one year through five years, Cost 111,171
Due after one year through five years, Fair Value 111,164
Marketable securities | Commercial paper  
Available-for-sale securities  
Due in one year or less, Cost 10,000
Due in one year or less, Fair Value 10,001
Due after one year through five years, Cost 0
Due after one year through five years, Fair Value $ 0