Stock-Based Compensation - Summary of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	$ 11,257	$ 8,577	$ 24,531	$ 16,981
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	437	436	860	883
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	1,786	1,673	3,647	3,463
Assumed performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	3,403	3,204	6,777	6,299
Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	5,041	2,800	11,828	5,224
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	590	464	1,419	1,112
Income Statement Location: us-gaap:SellingAndMarketingExpense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	9,148	6,663	20,281	13,411
Income Statement Location: wms:CostOfGoodsSoldExcludingEmployeeStockOptionPlanSpecialDividendCompensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	$ 2,109	$ 1,914	$ 4,250	$ 3,570