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Subsequent events | 9 Months Ended
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Sep. 30, 2015
Subsequent Event [Line Items] |
Subsequent event [Text Block] | Subsequent events On October 1, 2015, MDU Energy Capital entered into a note purchase agreement and issued $50.0 million of Senior Notes with a due date of October 1, 2030, at an interest rate of 4.31 percent. On October 29, 2015, the Company entered into a $150.0 million note purchase agreement and issued $98.0 million of Senior Notes with due dates ranging from October 30, 2025 to October 30, 2045, at a weighted average interest rate of 3.90 percent. The remaining $52.0 million of Senior Notes will be issued on December 10, 2015, with a due date of December 10, 2030, at an interest rate of 4.03 percent.

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References No definition available. + Details
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