Significant Accounting Policies - Schedule of Concentration Risk (Details) - Revenues - Customer Concentration Risk |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2024 |
Jun. 30, 2023 |
Jun. 30, 2024 |
Jun. 30, 2023 |
|
| Private | ||||
| Concentration Risk [Line Items] | ||||
| Concentration risk percentage | 35.60% | 36.80% | 39.20% | 39.00% |
| Public | ||||
| Concentration Risk [Line Items] | ||||
| Concentration risk percentage | 64.40% | 63.20% | 60.80% | 61.00% |
| North Carolina Department of Transportation | ||||
| Concentration Risk [Line Items] | ||||
| Concentration risk percentage | 12.50% | 11.20% | 10.30% | |
| Florida Department of Transportation | ||||
| Concentration Risk [Line Items] | ||||
| Concentration risk percentage | 13.40% | 11.20% | 13.90% | 10.20% |
| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|