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Stock-Based Employee Benefit Plans - Summary of ESPP activities (Details) | 12 Months Ended
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Sep. 30, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
ESPP, Discount from Market Price, Purchase Date | 15.00%
Employee Stock Purchase Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
ESPP, Discount from Market Price, Purchase Date | 85.00%
ESPP, Shares Issued in Period | shares | 50,298
ESPP, Per Share Weighted Average Price of Shares Purchased | $ / shares | $ 334.21

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