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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2023
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:
(Amounts in thousands)PipeInfiltrator International 
Allied Products
& Other
 Total
Balance at March 31, 2021
$57,663 $495,841 $11,126 $34,442 $599,072 
Acquisition11,134 — — — 11,134 
Currency translation— — 87 — 87 
Balance at March 31, 2022
68,797 495,841 11,213 34,442 610,293 
Acquisition— — — 11,060 11,060 
Asset held for sale— — — (367)(367)
Currency translation— — (793)— (793)
Balance at March 31, 2023
$68,797 $495,841 $10,420 $45,135 $620,193 
Summary of Intangible Assets
Intangible Assets – Intangible assets as of March 31, 2023 and 2022 consisted of the following:
 2023 2022
(Amounts in thousands)
Gross
Intangible
 Accumulated
Amortization		 
Net
Intangible
 
Gross
Intangible
 
Accumulated
Amortization
 
Net
Intangible
Definite-lived intangible assets           
Developed technology$192,268 $(81,141)$111,127 $176,068 $(64,751)$111,317 
Supplier and customer relationships401,525 (175,312)226,213 389,125 (140,830)248,295 
Patents and non-compete agreements9,594 (7,483)2,111 9,594 (6,837)2,757 
Trademarks and tradenames68,760 (12,446)56,314 65,960 (8,808)57,152 
Total definite lived intangible assets672,147 (276,382)395,765 640,747 (221,226)419,521 
Indefinite-lived intangible assets (a)
Trademarks11,862 — 11,862 11,864 — 11,864 
Total Intangible assets$684,009 $(276,382)$407,627 $652,611 $(221,226)$431,385 
(a)Indefinite-lived intangible assets decreased as a result of foreign currency translation.
Summary of Identifiable Intangible Assets The table below summarizes identifiable intangible assets:
(Amounts in thousands)Fair value
Customer relationships$12,400 
Patents and developed technology16,200
Tradename and trademarks2,800
Total identifiable intangible assets$31,400 
The identifiable intangible assets recorded in connection with the closing of the acquisition of Jet are supplier and customer relationships, tradename and non-compete agreements totaling $13.2 million.
(Amounts in thousands)Fair value
Supplier and customer relationships$11,300 
Other1,900 
Total identifiable intangible assets$13,200 
The following table presents the amortization expense and weighted average amortization period for definite-lived intangible assets at March 31, 2023:
 Amortization expense (in thousands) 
 Weighted Average
Amortization Period
(in years)
 202320222021 
Developed technology$16,390 $16,420 $17,405 6.2
Supplier and customer relationships34,523 43,542 50,177 10.9
Patents and non-compete agreements646 679 699 2.5
Trademarks and tradenames3,638 3,333 5,427 16.1
Total$55,197 $63,974 $73,708 
Future Intangible Asset Amortization Expense
Future intangible asset amortization expense based on existing intangible assets at March 31, 2023 is:
 Fiscal Year    
(Amounts in thousands)2024 2025 2026 2027 2028 Thereafter Total
Amortization expense$51,176 $47,920 $43,967 $40,601 $38,680 $173,421 $395,765