Emergence from Voluntary Reorganization under Chapter 11 / Fresh Start Accounting (Details)				3 Months Ended	4 Months Ended	5 Months Ended	9 Months Ended
	May 31, 2020 USD ($) $ / shares shares	May 29, 2020 USD ($) shares	Feb. 28, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	May 31, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Aug. 07, 2020 USD ($)	Mar. 01, 2020
Debt Instrument [Line Items]
Percent of ordinary shares exchanged for cancelled notes		94.25%
Percent of ordinary shares issued to common holders		5.75%
Common Stock, Issued, Conversion Ratio		0.0006849838
Pre-petition restructuring charges					$ 0	$ 16,822,000	$ 0
Fair value of Successor stockholders' equity	$ 18,084,000					$ 18,084,000
Postconfirmation Common Stock Per Share Value | $ / shares	$ 17.23
Convertible Debt [Member]
Debt Instrument [Line Items]
Rights offering commitment amount		$ 9,600,000		$ 9,600,000
Debt Instrument, Face Amount		$ 129,771,000			129,771,000
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Debt Instrument, Convertible, Number of Equity Instruments | shares		9,732,825
Debt Instrument, Required Repurchase Due to Change in Control, Redemption Price, Percentage		100.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 78,100,000			79,032,000
Debt Instrument, Required Repurchase Due to Change in Control, Redemption Price, Percentage		101.00%
Debt Instrument, Issuer's Optional Repurchase Due to Change in Control Prior to June 1, 2022, Redemption Price, Percentage		103.00%
Common Stock [Member]
Debt Instrument [Line Items]
Common Stock, Shares, Issued | shares	1,049,804	1,049,804				1,049,804
Restructuring Support Agreement [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Holders percentage under settlement agreement									99.00%
Restructuring Support Agreement [Member] | Prepetition Senior Notes [Member]
Debt Instrument [Line Items]
Holders percentage under settlement agreement									75.00%
Backstop Commitment Agreement [Member]
Debt Instrument [Line Items]
Pre-petition restructuring charges				$ 9,600,000
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, proceeds from borrowings					0
Letters of Credit Outstanding, Amount					8,800,000
Line of Credit Facility, Remaining Borrowing Capacity					$ 10,700,000
Debtor-in-Possession Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debtor-in-Possession Financing, Amount Arranged			$ 75,000,000
Debtor-in-Possession Financing, Term			5 months
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.75%
London Interbank Offered Rate (LIBOR) [Member] | Debtor-in-Possession Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debtor-in-Possession Financing, Basis Spread on Borrowings Outstanding			200
Base Rate [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.75%
Minimum [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, Asset Coverage Ratio, Required Minimum		1.5
Minimum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance, Fixed Charge Coverage Ratio, Required Minimum		1.0
Line of Credit, Minimum Availability (as % of Maximum) to Require Additional Fixed Charge Coverage Ratio Compliance		15.00%
Line of Credit, Minimum Availability to Require Additional Fixed Charge Coverage Ratio Compliance		$ 6,000,000
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt instrument, reference rate, minimum		0.00%
Maximum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 75,000,000						$ 40,000,000
Debt Instrument, Covenant Compliance, Capital Expenditure Limitation, Percentage of Annual Budget		125.00%
Maximum [Member] | Post-emergence revolving asset-based lending facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 75,000,000
Prepetition Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Accrued interest on Prepetition Senior Notes						$ 7,600,000
Interest Expense on Prepetition Liabilities Recognized in Statement of Operations						$ 3,100,000
Due on or prior to May 29, 2021 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Portion of Interest due in Cash, Percentage		50.00%
Debt Instrument, Portion of Interest due In-Kind, Percentage		50.00%
Debt Instrument, Portion of Interest due in-Kind at Majority Noteholder's Election, Percentage		100.00%
Commencing up to May 15, 2024 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		9.50%
Commencing up to May 15, 2024 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, reference rate, minimum		1.50%
Commencing on or after May 15, 2024 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		10.50%
Commencing on or after May 15, 2024 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, reference rate, minimum		1.50%
Consenting Noteholders [Member]
Debt Instrument [Line Items]
Rights offering commitment amount			118,000,000
Commitment premium			9,400,000
Senior Management [Member]
Debt Instrument [Line Items]
Rights offering commitment amount			1,800,000
Commitment premium			$ 100,000