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Long-Term Debt, Financing Leases and Other Borrowings - Additional Information (Detail) $ in Thousands					1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 27, 2019 USD ($)	Sep. 25, 2019 USD ($)	Jun. 14, 2019 USD ($) Air-craft	Jan. 28, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Debt Instrument [Line Items]
Property and equipment, net						$ 1,242,797			$ 1,242,797		$ 1,273,585
Long-Term Debt						787,964			787,964		$ 843,323
Loss on extinguishment of debt								$ 3,616		$ 3,616
Payment for debt extinguishment prepayment penalties										1,672
Proceeds from long-term debt									23,000	$ 91,200
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt									23,000
Equipment Notes [Member]
Debt Instrument [Line Items]
Long-Term Debt						181,800			$ 181,800
Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 91,200
Long term debt interest rate description									LIBOR plus 3.10%
Term loan, term				5 years
Write-off of financing cost				$ 1,900
Payment for debt extinguishment prepayment penalties				1,700
Term Loan [Member] | Spare Engine Facility [Member]
Debt Instrument [Line Items]
Long term debt interest rate description									LIBOR plus 7.25%
Loss on extinguishment of debt				$ 3,600
Term Loan [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate				3.10%
Term Loan [Member] | LIBOR [Member] | Spare Engine Facility [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate				7.25%
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] | CRJ-700 Aircraft [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 70,000		$ 70,000
Long term debt interest rate description			LIBOR plus 5.0%						monthly LIBOR plus 5.00%
Number of aircraft purchased | Air-craft			10
Payment for aircraft purchased			$ 70,000
Non-cash lease termination expense			$ 9,500
Notes Payable to Financial Institution, Collateralized by the Underlying Aircraft, Due 2023 [Member] | LIBOR [Member] | CRJ-700 Aircraft [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate					5.25%		5.00%		5.00%		5.25%
Working Capital Draw Loan [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 35,000
Long term debt interest rate description									one-month LIBOR plus 5.24%
Term loan, term		3 years
Debt instrument, expiration year and month		2022-09
Proceeds from long-term debt						23,000
Working Capital Draw Loan [Member] | LIBOR [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate		5.24%
Aircraft and Equipment [Member] | Pledged as Collateral [Member]
Debt Instrument [Line Items]
Property and equipment, net						$ 1,168,000			$ 1,168,000
Flight Equipment [Member] | Notes Payable to Financial Institution Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 8,000
Long term debt interest rate description	Libor plus 5.0%.								monthly LIBOR plus 5.00%
Flight Equipment [Member] | Notes Payable to Financial Institution Due 2023 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long term debt, basis spread on variable rate	5.25%						5.00%		5.00%		5.25%

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