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Investments - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | $ 70,558 | $ 197,165
Gross Unrealized Gains | 0 | 12
Gross Unrealized Losses | (1,155) | (69)
Short-term investments: | 37,910 | 149,057
Long-term investments: | 31,493 | 48,051
Fair Market Value | 69,403 | 197,108
U.S. Treasury |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, short-term | 2,000 | 4,222
Amortized cost, long-term | 7,481 | 6,996
Gross Unrealized Gains, short-term | 0 | 1
Gross Unrealized Gains, long-term | 0 | 1
Gross Unrealized Losses, short-term | (20) | 0
Gross Unrealized Losses, long-term | (215) | (2)
Short-term investments: | 1,980 | 4,223
Long-term investments: | 7,266 | 6,995
Foreign government and agency securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, short-term | 2,888 |
Amortized cost, long-term |  | 2,909
Gross Unrealized Gains, short-term | 0 |
Gross Unrealized Gains, long-term |  | 0
Gross Unrealized Losses, short-term | (38) |
Gross Unrealized Losses, long-term |  | (1)
Short-term investments: | 2,850 |
Long-term investments: |  | 2,908
Asset-backed securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, short-term |  | 4,812
Gross Unrealized Gains, short-term |  | 1
Gross Unrealized Losses, short-term |  | (2)
Short-term investments: |  | 4,811
Corporate debt securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized cost, short-term | 33,446 | 140,042
Amortized cost, long-term | 24,743 | 38,184
Gross Unrealized Gains, short-term | 0 | 6
Gross Unrealized Gains, long-term | 0 | 3
Gross Unrealized Losses, short-term | (366) | (25)
Gross Unrealized Losses, long-term | (516) | (39)
Short-term investments: | 33,080 | 140,023
Long-term investments: | $ 24,227 | $ 38,148

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