Revenues (LLC) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 296,404	$ 175,338	$ 579,678	$ 329,351
Over-time revenues
Disaggregation of Revenue [Line Items]
Revenues	173,290	106,856	335,512	213,847
Point-in-time revenue
Disaggregation of Revenue [Line Items]
Revenues	123,114	68,482	244,166	115,504
Custom products
Disaggregation of Revenue [Line Items]
Revenues	234,517	147,099	439,687	280,176
Powertrain solutions
Disaggregation of Revenue [Line Items]
Revenues	46,373	14,063	111,784	19,895
Standard products
Disaggregation of Revenue [Line Items]
Revenues	9,059	8,000	18,085	15,967
Services
Disaggregation of Revenue [Line Items]
Revenues	$ 6,455	$ 6,176	$ 10,122	$ 13,313

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details