Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Schedule of Intangible assets (Detail)

v3.24.3
Intangible Assets - Schedule of Intangible assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Gross Carrying Amount $ 33,000 $ 33,000
Intangibles subject to amortization, Accumulated Amortization 8,264 7,155
Total intangible amortization 24,736 25,845
Intangibles not subject to amortization, Gross Carrying Amount 6,700 6,700
Intangibles not subject to amortization, Net Carrying Amount 6,700 6,700
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Gross Carrying Amount 16,200 16,200
Intangibles subject to amortization, Accumulated Amortization 2,471 1,901
Total intangible amortization $ 13,729 $ 14,299
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 $ 12,600 $ 12,600
Intangibles subject to amortization, Accumulated Amortization 1,912 1,535
Total intangible amortization $ 10,688 $ 11,065
Technology and Technical Know-How [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangibles subject to amortization, Weighted Average Amortization Period 10 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 4 years
Intangibles subject to amortization, Gross Carrying Amount $ 3,900 $ 3,900
Intangibles subject to amortization, Accumulated Amortization 3,789 3,677
Total intangible amortization $ 111 $ 223
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 92 42
Total intangible amortization $ 208 $ 258
Intangibles not subject to amortization, Weighted Average Amortization Period Indefinite Indefinite
Intangibles not subject to amortization, Gross Carrying Amount $ 6,700 $ 6,700
Intangibles not subject to amortization, Net Carrying Amount $ 6,700 $ 6,700