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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 32 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 25, 2022 | Nov. 30, 2022 | Aug. 31, 2022 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2022 | May 31, 2022 | Mar. 18, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Authorized amount of stock to be repurchased |  |  |  |  |  |  | $ 50,000,000.0 | $ 50,000,000.0
Less repurchases made under this authorization | $ (23,300,000) | $ (26,000,000.0) | $ (5,100,000) | $ (4,200,000) | $ (31,100,000) |  |  |
Remaining Board authorization at November 30, 2022 |  | $ 26,200,000 |  |  | $ 26,200,000 | $ 26,200,000 |  |
Does Not Include Dutch Auction Tender Offer For Period Presented |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Less repurchases made under this authorization |  |  |  |  |  | $ (23,800,000) |  |

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