Annual report [Section 13 and 15(d), not S-K Item 405]

Intangible Assets - Schedule of Intangible assets (Detail)

v3.26.1
Intangible Assets - Schedule of Intangible assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Gross Carrying Amount $ 46,450 $ 33,000
Intangibles subject to amortization, Accumulated Amortization 7,788 9,373
Total intangible amortization 38,662 23,627
Intangibles not subject to amortization, Gross Carrying Amount 51,478 32,220
Intangibles not subject to amortization, Accumulated Amortization 0 0
Intangibles not subject to amortization, Net Carrying Amount 51,478 32,220
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Gross Carrying Amount 19,600 16,200
Intangibles subject to amortization, Accumulated Amortization 4,228 3,041
Total intangible amortization $ 15,372 $ 13,159
Customer Relationships [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period 8 years 8 years
Customer Relationships [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period 20 years 20 years
Technology and Technical Know-How [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Gross Carrying Amount $ 26,550 $ 12,600
Intangibles subject to amortization, Accumulated Amortization 3,318 2,290
Total intangible amortization $ 23,232 $ 10,310
Technology and Technical Know-How [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period 9 years 10 years
Technology and Technical Know-How [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period 20 years 20 years
Backlog [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period   4 years
Intangibles subject to amortization, Gross Carrying Amount   $ 3,900
Intangibles subject to amortization, Accumulated Amortization   3,900
Total intangible amortization   $ 0
Goodwill [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles not subject to amortization, Weighted Average Amortization Period Indefinite Indefinite
Intangibles not subject to amortization, Gross Carrying Amount $ 38,078 $ 25,520
Intangibles not subject to amortization, Net Carrying Amount $ 38,078 $ 25,520
Tradename [Member]    
Finite Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period 3 years 3 years
Intangibles subject to amortization, Gross Carrying Amount $ 300 $ 300
Intangibles subject to amortization, Accumulated Amortization 242 142
Total intangible amortization $ 58 $ 158
Intangibles not subject to amortization, Weighted Average Amortization Period Indefinite Indefinite
Intangibles not subject to amortization, Gross Carrying Amount $ 13,400 $ 6,700
Intangibles not subject to amortization, Net Carrying Amount $ 13,400 $ 6,700