v3.26.1
Goodwill and Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill by Reportable Segment
Goodwill - The carrying amount of goodwill by reportable segment is as follows:
As Previously Reported
(Amounts in thousands)PipeInfiltrator International 
Allied Products
& Other
StormwaterWastewater 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 
Summary of Intangible Assets
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 relationships902,700 (255,237)647,463 481,100 (220,047)261,053 
Patents and non-compete agreements3,738 (3,035)703 3,738 (2,687)1,051 
Trademarks and tradenames112,330 (23,439)88,891 74,960 (19,260)55,700 
Total definite lived intangible assets1,231,888 (395,204)836,684 771,998 (335,777)436,221 
Indefinite-lived intangible assets (a)
Trademarks11,843 — 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.
Summary of Identifiable Intangible Assets The preliminary fair values and useful lives of acquired intangible assets is presented in the table below.
(Amounts in thousands)Preliminary fair valuePreliminary Useful Lives
Customer relationships$419,000 20 years
Tradename37,00020 years
Developed technology92012 years
Total identifiable intangible assets$456,920 
The identifiable intangible assets recorded in connection with the acquisition of River Valley Pipe are based on preliminary valuations including customer relationships and tradename totaling $3.0 million. The intangible assets will be amortized on a straight-line basis over their estimated useful lives.
(Amounts in thousands)Preliminary fair valuePreliminary Useful Lives
Customer relationships$2,600 10 years
Tradename3705 years
Total identifiable intangible assets$2,970 
The intangible assets will be amortized on a straight-line basis over their estimated useful lives.
(Amounts in thousands)Fair valueUseful Lives
Customer relationships$99,000 15 years
Developed technology42,00012 years
Tradename7,00020 years
Total identifiable intangible assets$148,000 
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)
 202620252024 
Developed technology$19,710 $18,230 $16,480 7.0
Supplier and customer relationships35,187 30,207 30,460 15.9
Patents and non-compete agreements348 487 560 6.3
Trademarks and tradenames4,179 3,645 3,969 16.3
Total$59,424 $52,569 $51,469 
Future Intangible Asset Amortization Expense
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