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Leases - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) AirCraft | Dec. 31, 2022 USD ($) AirCraft | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) AirCraft | Mar. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of leased aircraft | 18 |  |  | 18 |
Aggregate rental expense under all operating aircraft, equipment and facility leases | $ | $ 3,785 |  | $ 11,629 | $ 10,694 | $ 23,478
Weighted average remaining lease term Operating leases | 6 years |  |  | 6 years |
Weighted average discount rate Operating leases | 4.90% |  |  | 4.90% |
RASPRO Aircraft Lease Agreement [Member] |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of aircraft lease terminated |  | 15 |  |  |
Buyout pricing | $ |  | $ 25,000 |  |  |
RASPRO Aircraft Lease Agreement [Member] | CRJ-900 Aircraft [Member] |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Number of leased aircraft |  | 15 |  |  |

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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