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Short-Term and Long-Term Investments - Schedule of Investments That Have Been in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Fair Value    
Less than 12 months $ 391,590 $ 274,535
12 months or greater 0 0
Total 391,590 274,535
Gross Unrealized Losses    
Less than 12 months (688) (121)
12 months or greater 0 0
Total (688) (121)
Corporate Bonds and Notes    
Fair Value    
Less than 12 months 196,228 151,986
12 months or greater 0 0
Total 196,228 151,986
Gross Unrealized Losses    
Less than 12 months (372) (86)
12 months or greater 0 0
Total (372) (86)
Municipal Bonds And Notes [Member]    
Fair Value    
Less than 12 months 16,144 13,764
12 months or greater 0 0
Total 16,144 13,764
Gross Unrealized Losses    
Less than 12 months (41) (9)
12 months or greater 0 0
Total (41) (9)
U.S. Government Securities    
Fair Value    
Less than 12 months 160,275 77,401
12 months or greater 0 0
Total 160,275 77,401
Gross Unrealized Losses    
Less than 12 months (242) (12)
12 months or greater 0 0
Total (242) (12)
U.S. Government Agency Securities    
Fair Value    
Less than 12 months 18,943 31,384
12 months or greater 0 0
Total 18,943 31,384
Gross Unrealized Losses    
Less than 12 months (33) (14)
12 months or greater 0 0
Total $ (33) $ (14)