Employee Benefit Plans	12 Months Ended
Mar. 31, 2026
Postemployment Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS KSOP Retirement Plan (“KSOP”) - The Company’s KSOP holds shares of redeemable common stock. The common stock held by the KSOP is classified as mezzanine equity as the shares are subject to the put option requirements of the Internal Revenue Code. When participants sell or forfeit these shares, the shares would no longer be subject to the put option of the Internal Revenue Code and would no longer required to be classified in mezzanine equity. Profit-Sharing Retirement Plan - On April 11, 2022, the ESOP was merged into the existing 401(k) retirement plan effective April 1, 2022 creating the KSOP. The tax-qualified profit-sharing retirement plan has a 401(k) feature covering substantially all U.S. eligible employees. Except for employer matching contributions made on behalf of Infiltrator employee-participants, the Company made employer contributions of $15.1 million, $14.2 million and $9.2 million in the fiscal years ended March 31, 2026, 2025, and 2024 respectively. Redeemable Common Stock - The put option requirements of the Internal Revenue Code apply in the event that the Company’s common stock is not a registration type class of security, or its trading has been restricted. Therefore, the holders of common stock within the KSOP have a put right to require the Company to repurchase such shares in the event that the common stock is not listed for trading or otherwise quoted on the NYSE, AMEX, NASDAQ, or any other market more senior than the OTC Bulletin Board. Defined Contribution Postretirement Plan - The Company has defined contribution postretirement benefit plans covering Canadian employees. The Company recognized costs of $2.1 million, $2.2 million and $2.0 million in the fiscal years ended March 31, 2026, 2025, and 2024, respectively.

KSOP Retirement Plan (“KSOP”) - The Company’s KSOP holds shares of redeemable common stock. The common stock held by the KSOP is classified as mezzanine equity as the shares are subject to the put option requirements of the Internal Revenue Code. When participants sell or forfeit these shares, the shares would no longer be subject to the put option of the Internal Revenue Code and would no longer required to be classified in mezzanine equity.

Profit-Sharing Retirement Plan - On April 11, 2022, the ESOP was merged into the existing 401(k) retirement plan effective April 1, 2022 creating the KSOP. The tax-qualified profit-sharing retirement plan has a 401(k) feature covering substantially all U.S. eligible employees. Except for employer matching contributions made on behalf of Infiltrator employee-participants, the Company made employer contributions of $15.1 million, $14.2 million and $9.2 million in the fiscal years ended March 31, 2026, 2025, and 2024 respectively.

Redeemable Common Stock - The put option requirements of the Internal Revenue Code apply in the event that the Company’s common stock is not a registration type class of security, or its trading has been restricted. Therefore, the holders of common stock within the KSOP have a put right to require the Company to repurchase such shares in the event that the common stock is not listed for trading or otherwise quoted on the NYSE, AMEX, NASDAQ, or any other market more senior than the OTC Bulletin Board.

Defined Contribution Postretirement Plan - The Company has defined contribution postretirement benefit plans covering Canadian employees. The Company recognized costs of $2.1 million, $2.2 million and $2.0 million in the fiscal years ended March 31, 2026, 2025, and 2024, respectively.