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Shareholders' Equity - Share repurchase program (Details) - USD ($) $ in Millions	3 Months Ended	4 Months Ended
	Jul. 31, 2021	Jul. 31, 2021	Mar. 31, 2021
Equity Class Of Treasury Stock [Line Items]
Stock repurchased	157,513
Stock repurchase cost	$ 7.6
Stock repurchased during period	325,462
Stock repurchase cost	$ 7.6	$ 15.1
Remaining authorized repurchase amount	$ 84.9	$ 84.9
Maximum
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, Authorized amount			$ 100.0

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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