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Income Taxes - Summary of Income Tax Provision (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]      
Current — Federal $ 23,985,000 $ 17,463,000 $ 14,745,000
Current — State 6,833,000 4,707,000 5,357,000
Subtotal 30,818,000 22,170,000 20,102,000
Deferred — Federal (4,594,000) (2,828,000) (1,321,000)
Deferred — State (565,000) (493,000) (592,000)
Subtotal (5,159,000) (3,321,000) (1,913,000)
Total $ 25,659,000 $ 18,849,000 $ 18,189,000