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Assets Held for Sale - Summarizes Company's Held for Sale Activity (Detail)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
USD ($)
Long-Lived Assets Held-for-Sale [Line Items]  
Assets held for sale, Beginning balance $ 12,000
Assets held for sale, Ending balance 40,336
Current Assets [Member]  
Long-Lived Assets Held-for-Sale [Line Items]  
Assets held for sale, Beginning balance 57,700
Assets held for sale, Ending balance 92,300
Noncurrent Assets [Member]  
Long-Lived Assets Held-for-Sale [Line Items]  
Assets held for sale, Beginning balance 12,000
Assets held for sale, Ending balance 40,300
CRJ-900 Aircraft [Member]  
Long-Lived Assets Held-for-Sale [Line Items]  
Assets held for sale, Beginning balance 69,700
Assets sold (53,900)
Assets reclassified to held for sale 111,700
Impairment gain due to fair value adjustments 5,100
Assets held for sale, Ending balance 132,600
CRJ-900 Aircraft [Member] | Current Assets [Member]  
Long-Lived Assets Held-for-Sale [Line Items]  
Assets held for sale, Beginning balance 57,700
Assets sold (41,900)
Assets reclassified to held for sale 71,400
Impairment gain due to fair value adjustments 5,100
Assets held for sale, Ending balance 92,300
CRJ-900 Aircraft [Member] | Noncurrent Assets [Member]  
Long-Lived Assets Held-for-Sale [Line Items]  
Assets held for sale, Beginning balance 12,000
Assets sold (12,000)
Assets reclassified to held for sale 40,300
Assets held for sale, Ending balance $ 40,300