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Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 378,709	$ 186,224	$ 958,387	$ 515,575
Over-time revenues
Disaggregation of Revenue [Line Items]
Revenues	214,505	113,162	550,018	327,011
Point-in-time revenue
Disaggregation of Revenue [Line Items]
Revenues	164,204	73,062	408,369	188,564
Custom products
Disaggregation of Revenue [Line Items]
Revenues	259,283	142,170	698,971	422,347
Powertrain solutions
Disaggregation of Revenue [Line Items]
Revenues	98,924	28,427	210,707	48,322
Standard products
Disaggregation of Revenue [Line Items]
Revenues	13,207	8,618	31,292	24,585
Services
Disaggregation of Revenue [Line Items]
Revenues	$ 7,295	$ 7,009	$ 17,417	$ 20,321

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