Commitment and Contingencies - Long Term Purchase Commitments (Details) - aircraft	Dec. 31, 2022	Sep. 30, 2022
Long-term Purchase Commitment [Line Items]
2022		114
2023		90
2024		86
2025		86
2026		70
2027		36
2028		30
2029		50
2030		60
2031		10
Total		632
-7 Firm Orders
Long-term Purchase Commitment [Line Items]
2022		14
2023		42
2024		30
2025		30
2026		15
2027		15
2028		15
2029		20
2030		15
2031		0
Total		196
-8 Firm Orders
Long-term Purchase Commitment [Line Items]
2022		100
2023		48
2024		0
2025		0
2026		15
2027		15
2028		15
2029		30
2030		45
2031		10
Total		278
Other Commitment, Number Of Aircrafts To Be Delivered		35
-8 Firm Orders | Forecast
Long-term Purchase Commitment [Line Items]
Other Commitment, Number Of Aircrafts To Be Delivered	31
-7 or -8 Options
Long-term Purchase Commitment [Line Items]
2022		0
2023		0
2024		56
2025		56
2026		40
2027		6
2028		0
2029		0
2030		0
2031		0
Total		158