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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

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