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Debt: Notes Payable (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Debt: Notes Payable (Details) - USD ($) $ in Millions	Apr. 30, 2022	Mar. 29, 2025	Sep. 30, 2021
Note Agreement \| Notes Payable
Notes Payable
Principal amount outstanding		$ 30.0
Note Agreement \| Series C Notes
Notes Payable
Principal amount outstanding		$ 30.0
Note payable, face amount			$ 30.0
Debt term		7 years
Interest rate (as a percent)		3.18%
Minimum prepayment		$ 1.0
Shelf Agreement \| Senior Notes
Notes Payable
Shelf Agreement term	3 years
Maximum amount of Shelf Notes available for issuance.	$ 100.0
Minimum prepayment	$ 1.0
Shelf Agreement \| Senior Notes \| Maximum
Notes Payable
Debt term	12 years 6 months