Percentage of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

No definition available.

Long-term debt: (Details) - USD ($) $ in Thousands					1 Months Ended		3 Months Ended		6 Months Ended
Long-term debt: (Details) - USD ($) $ in Thousands	Apr. 11, 2025	Jun. 15, 2024	Jun. 11, 2024	May 02, 2024	Nov. 30, 2024	May 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Oct. 31, 2024	Apr. 30, 2024	Dec. 31, 2024
Long-term debt
Lease payments							$ 8,003	$ 23,235
Subsequent Events
Long-term debt
Proceeds from issuance of secured debt	$ 170,500
Interest rate swap
Long-term debt
Net liability							22,500				$ 22,300
Interest rate swap \| Cash
Long-term debt
Margin deposits							23,600
Interest rate swap \| Restricted cash
Long-term debt
Margin deposits							22,500
Interest rate swap \| Unrestricted cash
Long-term debt
Margin deposits							1,100
Interest rate swap \| Accrued and other current liabilities
Long-term debt
Net liability							18,600				18,300
Interest rate swap \| Other long-term liabilities
Long-term debt
Net liability							$ 3,900				$ 4,000
SOFR \| Interest rate swap
Long-term debt
Interest rate (as a percent)							3.50%
Payment made to counter party						$ 12,100
Net proceeds									$ 12,100	$ 12,100
Payment of debt in Installments					$ 12,100
2027 Mirror Notes
Long-term debt
Face amount			$ 300,000				$ 300,000
Interest rate (as a percent)			7.00%
Percentage of face value							98.50%
Proceeds from issuance of secured debt							$ 291,900
Lease payments							114,600
Maturity date			Jun. 15, 2027
Minimum percentage of principal amount entitled for redemption			90.00%
2027 Mirror Notes \| Minimum
Long-term debt
Percentage of principal amount considered as default debt			25.00%
2027 Mirror Notes \| Redemption of some or all the notes
Long-term debt
Redemption price percentage of principal amount redeemed		103.50%
2027 Mirror Notes \| If certain events have occurred
Long-term debt
Repurchase price, percentage			101.00%
2027 Mirror Notes \| If certain events have not occurred
Long-term debt
Repurchase price in cash, percentage			100.00%
Secured IPv4 Notes \| Subsequent Events
Long-term debt
Face amount	$ 380,400
Interest rate (as a percent)	6.646%
IPv4 Notes
Long-term debt
Face amount				$ 206,000			$ 206,000
Interest rate (as a percent)				7.924%			7.924%
Proceeds from issuance of secured debt				$ 198,400
Maturity date				May 31, 2054
Additional interest accrued on percentage of principal amount				5.00%
IPv4 Notes \| Base rate
Long-term debt
Debt Instrument, Basis Spread on Variable Rate							5.00%
IPv4 Notes \| United States Treasury interest
Long-term debt
Debt Instrument, Basis Spread on Variable Rate							3.40%
Senior Unsecured Notes of 7.00 Due 2027
Long-term debt
Face amount							$ 450,000
Interest rate (as a percent)							7.00%
New IPv4 Notes \| Subsequent Events
Long-term debt
Face amount	$ 174,400
Maturity date	Apr. 30, 2055
Additional interest accrued on percentage of principal amount	5.00%
New IPv4 Notes \| Base rate \| Subsequent Events
Long-term debt
Debt Instrument, Basis Spread on Variable Rate	5.00%
New IPv4 Notes \| United States Treasury interest \| Subsequent Events
Long-term debt
Debt Instrument, Basis Spread on Variable Rate	3.00%