Flight equipment subject to operating lease - Narrative (Details) $ in Thousands	1 Months Ended			3 Months Ended			12 Months Ended	40 Months Ended
	May 05, 2025 USD ($)	Dec. 31, 2023 USD ($) aircraft	Oct. 31, 2022 USD ($) aircraft	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	May 05, 2025 USD ($)
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Proceeds from settlement of insurance claim				$ 328,546	$ 0
S7
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Number of aircrafts subject to insurance policies | aircraft		4
Flight Equipment
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Write-off of aircrafts							$ 771,500
Proceeds from settlement of insurance claim				$ 328,500
Write-off of its interests						$ 791,000
Benefit recorded related to return of aircraft from Russia			$ 30,900
Number of aircrafts returned from Russia | aircraft			1
Flight Equipment | S7
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Proceeds from settlement of insurance claim		$ 64,900
Flight Equipment | Subsequent Event
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Proceeds from settlement of insurance claim	$ 226,700							$ 651,000
Flight Equipment | Subsequent Event | C&P Insurers
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items]
Proceeds from settlement of insurance claim	$ 226,700							$ 555,300