Note 5 - Debt and Credit Facilities (Details Textual)					1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 21, 2023 USD ($)	Mar. 31, 2023 USD ($)	Mar. 14, 2023 USD ($)	Feb. 26, 2021 USD ($) $ / shares	Aug. 31, 2023 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares	Feb. 26, 2024 USD ($)	Jul. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)
Long-Term Debt, Total						$ 452,000,000		$ 452,000,000		$ 317,000,000
Gain (Loss) on Extinguishment of Debt						$ (27,000,000)	$ (0)	$ (27,000,000)	$ (0)
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.01		$ 0.01		$ 0.01		$ 0.01
Embedded Derivative, Fair Value of Embedded Derivative Liability						$ 2,000,000		$ 2,000,000		$ 4,000,000
Percentage Of Stock Of Material Domestic Subsidiaries Securing Credit Agreement										100.00%
Percentage Of Stock Of Material First Tier Foreign Subsidiaries Securing Credit Agreement										65.00%
A B L Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 90,000,000
Amended A B L Credit Agreement [Member]
Excess Availability Percentage Of Lender Commitments Threshold Triggering Cash Dominion Control										12.50%
Lender Commitments Threshold Trigger Excess Availability Amount										$ 11,250,000
Excess Availability Below Which Fixed Charge Coverage Ratios Triggered										12.50%
Fixed Charged Coverage Ratio Required										1
L C Facility Agreement [Member]
Line of Credit Facility, Daily Minimum Liquidity			$ 50,000,000
Letters of Credit Outstanding, Amount						31,000,000		$ 31,000,000		$ 43,000,000
Debt Instrument, Basis Spread on Variable Rate								2.75%
Line of Credit Facility, Commitment Fee Percentage								0.25%
Line of Credit Facility, Aggregate Cash Collateral Percentage								104.00%
Letter of Credit, Commitment Amount			50,000,000			50,000,000		$ 50,000,000					$ 100,000,000
Letters of Credit, Amount Transferred	$ 58,000,000
Proceeds From Issuance of Debt, Collateralize Letters of Credit	59,000,000				$ 68,000,000
Letter Of Credit Cash Collateral						32,000,000		$ 32,000,000		44,000,000
Line of Credit Facility, Percentage of Letter of Credit Fee								3.75%
Amended A B L Credit Agreement [Member]
Line of Credit Facility, Daily Minimum Liquidity			50,000,000
Line of Credit Facility, Quarterly Minimum Liquidity			$ 80,000,000
Letters of Credit Outstanding, Amount										58,000,000			$ 58,000,000
Minimum Liquidity Current Balance		$ 143,000,000								$ 150,000,000
Excess Availability Percentage Of Lender Commitments Threshold Triggering Cash Dominion Control										12.50%
Lender Commitments Threshold Trigger Excess Availability Amount										$ 11,250,000
Line of Credit Facility, Remaining Borrowing Capacity										$ 21,000,000				$ 17,000,000
Excess Availability Below Which Fixed Charge Coverage Ratios Triggered										12.50%
Amended A B L Credit Agreement [Member] | Forecast [Member]
Line of Credit Facility, Maximum Borrowing Capacity											$ 81,000,000
Letter of Credit [Member] | A B L Credit Agreement [Member]
Line of Credit Facility, Commitment Fee Percentage										0.25%
A B L Credit Agreement [Member]
Lender Commitments Threshold Trigger Excess Availability Amount										$ 11,250,000
Excess Availability Below Which Fixed Charge Coverage Ratios Triggered										12.50%
Proforma Fixed Charge Coverage Ratio										1
Consolidated EBITDA Exceeding Fixed Charges, Amount		$ 9,000,000
Letter Of Credit Facility Agreement [Member]
Line of Credit Facility, Aggregate Cash Collateral Percentage				103.00%
Minimum Liquidity Requirement										$ 80,000,000
Two Thousand Twenty One Notes Embedded Derivative [Member]
Embedded Derivative, Fair Value of Embedded Derivative Liability				$ 12,000,000						2,000,000		$ 5,000,000
Original Term Loan Credit Agreement [Member]
Long-Term Debt, Total	293,000,000
Proceeds from Issuance of Debt								$ 0	49,000,000
Repayments of Debt	316,000,000							$ 316,000,000	$ (0)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	2,000,000
Gain (Loss) on Extinguishment of Debt						(23,000,000)
Two Thousand Twenty One Convertible Debt [Member]
Debt Instrument, Face Amount				$ 25,000,000
Debt Instrument, Interest Rate, Stated Percentage				5.00%
Repayments of Debt	25,000,000
Gain (Loss) on Extinguishment of Debt						(4,000,000)
Debt Instrument, Convertible, Conversion Ratio				100
Debt Conversion, Original Debt, Amount				$ 1,000
Initial Conversion Price Per Share of Common Stock (in dollars per share) | $ / shares				$ 10
Debt Instrument, Convertible, Stock Price Trigger (in dollars per share) | $ / shares				$ 14.5
Debt Instrument, Convertible, Threshold Consecutive Trading Days				60
Holder Fundamental Transaction Election Period (Day)				30 days
Convertible Notes Payable, Noncurrent										18,000,000
Debt Instrument, Unamortized Discount										9,000,000
Convertible Debt, Fair Value Disclosures	24,000,000									$ 16,000,000
Extinguishment of Debt, Amount	28,000,000
Minimum [Member] | Amended A B L Credit Agreement [Member]
Fixed Charged Coverage Ratio Required										1
Minimum [Member] | Revolving Credit Facility [Member] | Amended A B L Credit Agreement [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.375%
Minimum [Member] | Revolving Credit Facility [Member] | Amended A B L Credit Agreement [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate			3.50%
Minimum [Member] | Revolving Credit Facility [Member] | L C Facility Agreement [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage								0.375%
Minimum [Member] | Two Thousand Twenty One Convertible Debt [Member]
Debt Instrument, Convertible, Threshold Trading Days				45
Maximum [Member] | Revolving Credit Facility [Member] | L C Facility Agreement [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage								0.50%
Term Loan Credit Agreement [Member]
Long-Term Debt, Total				$ 225,000,000
Long Term Debt, Maximum Additional Proceeds				$ 50,000,000
Refinancing Term Loans [Member]
Debt Instrument, Face Amount						$ 450,000,000		$ 450,000,000
Debt Instrument, Interest Rate, Annum Payable						7.50%		7.50%
Debt Instrument, Interest Rate, Payable In-kind						5.00%		5.00%
Debt Instrument, Interest Rate, Stated Percentage						12.50%		12.50%
Refinancing Term Loans [Member] | Minimum [Member]
Debt Instrument, Material Indebtness						$ 20,000,000		$ 20,000,000
Refinancing Term Loans [Member] | Minimum [Member] | UNITED STATES
Maximum Amount Liquidity Required						60,000,000		60,000,000
Refinancing Term Loans [Member] | Maximum [Member]
Debt Instrument, Material Indebtness						25,000,000		25,000,000
Refinancing Term Loans [Member] | Maximum [Member] | UNITED STATES
Maximum Amount Liquidity Required						$ 85,000,000		$ 85,000,000
Refinancing Term Loans [Member] | Used to Refinance Obligations [Member]
Proceeds from Issuance of Debt	435,000,000
Refinancing Term Loans [Member] | General Corporate Purposes and Working Capital Needs [Member]
Proceeds from Issuance of Debt	$ 29,000,000