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Financing: At-the-Market Equity Offering Program (Details) - USD ($) $ in Millions	Jun. 16, 2023	Aug. 04, 2020
At The Market Equity Offering Program Authorized Aggregate Value	$ 400	$ 400

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- Definition

At The Market Equity Offering Program authorized an aggregate value that the Company may, through its sales agents, offer and sell from time to time shares of its common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	bkh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant