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Commitments - Minimum Royalties (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Remainder of 2025 | $ 11 |  | $ 11 |
2026 | 396 |  | 396 |
2027 | 384 |  | 384 |
2028 | 359 |  | 359 |
2029 | 347 |  | 347 |
Thereafter | 1,977 |  | 1,977 |
Total | 3,474 |  | 3,474 |
Royalty expense | $ 800 | $ 500 | $ 2,200 | $ 1,300

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- Definition Royalty, Future Minimum Payments Due + References No definition available. + Details
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- Definition Royalty, Future Minimum Payments Due In Year Four + References No definition available. + Details
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- Definition Royalty, Future Minimum Payments Due In Year One + References No definition available. + Details
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- Definition Royalty, Future Minimum Payments Due In Year Three + References No definition available. + Details
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- Definition Royalty, Future Minimum Payments Due In Year Two + References No definition available. + Details
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- Definition Royalty, Future Minimum Payments Due Remainder of Fiscal Year + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Royalty, Future Minimum Payments Due Thereafter + References No definition available. + Details
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Namespace Prefix: | road_
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Balance Type: | credit
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- References No definition available. + Details
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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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