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Computation of Earnings Per Common Share - Narratives (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2022 | Oct. 29, 2022 | Sep. 15, 2015
Shares used in computing earnings per common share: |  |  |
Purchase of warrants | $ 0.7 |  |
Convertible senior notes |  |  |
Shares used in computing earnings per common share: |  |  |
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) |  | $ 96.89 |
0.75% Convertible Senior Notes Due 2021 |  |  |
Shares used in computing earnings per common share: |  |  |
Debt, interest rate (in percent) |  | 0.75% |
Warrant Transaction |  |  |
Shares used in computing earnings per common share: |  |  |
Class of warrant or right, exercise price of warrants or rights (per warrant) |  |  | $ 130.43

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