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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jul. 31, 2026	Jul. 31, 2026	May 31, 2026	Mar. 23, 2026	Mar. 04, 2026	Feb. 10, 2026	Mar. 31, 2025	Sep. 30, 2023	Mar. 31, 2022
Share Repurchase Program [Line Items]
Tender offer, authorized amount					$ 140.0	$ 180.0
Tender offer, shares acquired (in shares)				24,347,825
Tender offer, cost (in dollars per share)				$ 5.75
Tender offer, shares acquired, value				$ 140.0
Shares repurchased during period (in shares)	1,817,696	1,817,696
2016 Equity Incentive Plan
Share Repurchase Program [Line Items]
Award expiration period (in years)		10 years
Number of shares available for futures issuance (in shares)	4,500,000	4,500,000
Share Repurchase Program 2022
Share Repurchase Program [Line Items]
Stock repurchase program, authorized amount									$ 100.0
Share repurchase program, additional authorized amount			$ 100.0				$ 50.0	$ 50.0
Stock repurchase program, remaining authorized repurchase amount	$ 106.2	$ 106.2
Minimum
Share Repurchase Program [Line Items]
Tender offer, authorized amount (in dollars per share)						$ 5.75
Maximum
Share Repurchase Program [Line Items]
Tender offer, authorized amount (in dollars per share)						$ 6.50