| Goodwill and Intangible Assets |
GOODWILL AND INTANGIBLE ASSETS Goodwill - The carrying amount of goodwill by reportable segment is as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As Previously Reported | | | | | | | | (Amounts in thousands) | Pipe | | Infiltrator | | International | | Allied Products & Other | | Stormwater | | Wastewater | | Total | Balance at March 31, 2024 | $ | 65,766 | | | $ | 495,841 | | | $ | 10,441 | | | $ | 45,135 | | | $ | — | | | $ | — | | | $ | 617,183 | | | Acquisition | — | | | 103,676 | | | — | | | — | | | — | | | — | | | 103,676 | | | Currency translation | — | | | — | | | (636) | | | — | | | — | | | — | | | (636) | | Balance at March 31, 2025 | 65,766 | | | 599,517 | | | 9,805 | | | 45,135 | | | — | | | — | | | 720,223 | | | Reallocation due to change in segments | (65,766) | | | (599,517) | | | (9,805) | | | (45,135) | | | 120,706 | | | 599,517 | | | — | | | Acquisitions | — | | | — | | | — | | | — | | | 321,612 | | | 555 | | | 322,167 | | | Currency translation | — | | | — | | | — | | | — | | | 326 | | | — | | | 326 | | Balance at March 31, 2026 | $ | — | | | $ | — | | | $ | — | | | $ | — | | | $ | 442,644 | | | $ | 600,072 | | | $ | 1,042,716 | |
Intangible Assets - Intangible assets as of March 31, 2026 and 2025 consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2026 | | 2025 | | (Amounts in thousands) | Gross Intangible | | Accumulated
Amortization | | Net Intangible | | Gross Intangible | | Accumulated Amortization | | Net Intangible | | Definite-lived intangible assets | | | | | | | | | | | | | Developed technology | $ | 213,120 | | | $ | (113,493) | | | $ | 99,627 | | | $ | 212,200 | | | $ | (93,783) | | | $ | 118,417 | | | Supplier and customer relationships | 902,700 | | | (255,237) | | | 647,463 | | | 481,100 | | | (220,047) | | | 261,053 | | | Patents and non-compete agreements | 3,738 | | | (3,035) | | | 703 | | | 3,738 | | | (2,687) | | | 1,051 | | | Trademarks and tradenames | 112,330 | | | (23,439) | | | 88,891 | | | 74,960 | | | (19,260) | | | 55,700 | | | Total definite lived intangible assets | 1,231,888 | | | (395,204) | | | 836,684 | | | 771,998 | | | (335,777) | | | 436,221 | | Indefinite-lived intangible assets (a) | | | | | | | | | | | | | Trademarks | 11,843 | | | — | | | 11,843 | | | 11,839 | | | — | | | 11,839 | | | Total Intangible assets | $ | 1,243,731 | | | $ | (395,204) | | | $ | 848,527 | | | $ | 783,837 | | | $ | (335,777) | | | $ | 448,060 | |
(a)Indefinite-lived intangible assets may fluctuate as a result of foreign currency translation. The following table presents the amortization expense and weighted average amortization period for definite-lived intangible assets at March 31, 2026: | | | | | | | | | | | | | | | | | | | | | | | | | | Amortization expense (in thousands) | | Weighted Average Amortization Period (in years) | | | 2026 | | 2025 | | 2024 | | | Developed technology | $ | 19,710 | | | $ | 18,230 | | | $ | 16,480 | | | 7.0 | | Supplier and customer relationships | 35,187 | | | 30,207 | | | 30,460 | | | 15.9 | | Patents and non-compete agreements | 348 | | | 487 | | | 560 | | | 6.3 | | Trademarks and tradenames | 4,179 | | | 3,645 | | | 3,969 | | | 16.3 | | Total | $ | 59,424 | | | $ | 52,569 | | | $ | 51,469 | | | |
Future intangible asset amortization expense based on existing intangible assets at March 31, 2026 is: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fiscal Year | | | | | | (Amounts in thousands) | 2027 | | 2028 | | 2029 | | 2030 | | 2031 | | Thereafter | | Total | | Amortization expense | $ | 80,233 | | | $ | 84,640 | | | $ | 87,849 | | | $ | 73,341 | | | $ | 64,366 | | | $ | 446,255 | | | $ | 836,684 | |
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