Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions		3 Months Ended		12 Months Ended
	Jan. 31, 2023 AirCraft	Dec. 31, 2022 USD ($) AirCraft	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) AirCraft
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue		$ 5.3
Lease revenue		$ 41.1	$ 40.3
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]		Revenue From Contract With Customer Excluding Assessed Tax	Revenue From Contract With Customer Excluding Assessed Tax
Current and non-current deferred credit contract liability balances		$ 3.7		$ 3.9
Recognized deferred credits within contract revenue		0.2	$ 0.2
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense		0.8	0.2
Deferred heavy maintenance balance, net of accumulated amortization		10.3		$ 9.7
Engine overhaul expense		8.7	5.3
Engine overhaul pass-through expense		8.7	3.8
Airframe check expense		5.1	9.1
Airframe check pass-through expense		$ 4.4	$ 0.0
Aircraft [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage leased		11.00%
CRJ 700 [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of aircraft to be leased | AirCraft		20		20
Operating lease, term of contract		9 years
CRJ 700 [Member] | GoJet Agreements [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of aircraft classified as assets held for sale | AirCraft				18
Number of aircraft sold | AirCraft				10
Subsequent Event [Member] | CRJ 700 [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of aircraft classified as assets held for sale | AirCraft	8
Number of aircraft sold | AirCraft	8