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Schedule II - Valuation and Qualifying Accounts (Detail) - Allowance for expected credit losses [Member] - USD ($)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 4,245,000 $ 2,823,000 $ 2,562,000
Additions Charged to Cost and Expenses 3,530,000 1,828,000 1,216,000
Deductions (86,000) (406,000) (955,000)
Balance at End of Year $ 7,689,000 $ 4,245,000 $ 2,823,000