Revenue - Contract Balances (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Sep. 30, 2025 |
|
| Revenue from Contract with Customer [Abstract] | ||
| Contract assets | $ 113,297 | $ 136,679 |
| Contract liabilities | (314,506) | (297,949) |
| Net contract liability | (201,209) | (161,270) |
| Revenue recognized related to contract liabilities | 204,300 | |
| Retention amounts included in accounts receivable | 6,000 | $ 8,100 |
| Retained amount expected to be collected in the next twelve months | 5,800 | |
| Retained amount expected to be collected | $ 200 |
| X | ||||||||||
- Definition Contract with Customer, Asset (Liability), Net, Current No definition available.
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|