Quarterly Results (Unaudited) - Summary of Unaudited Quarterly Results of Operations (Detail) - USD ($)	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 895,589,000	$ 795,311,000	$ 718,562,000
Gross Profit	209,728,000	171,693,000	158,259,000
Net Income (Loss)	$ 95,165,000	$ 76,252,000	$ 66,365,000
Net Income per Basic Common Share	$ 1.85	$ 1.48	$ 1.28
Net Income per Diluted Common Share	$ 1.83	$ 1.47	$ 1.26

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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