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| 0000073088-23-000098-index.html | 2023-04-27 19:36:35 | |
| 0000073088-23-000098.txt | 2023-04-27 19:36:35 | |
 0000073088-23-000098-xbrl.zip | 315854 | 2023-04-27 19:36:35 |
| ex311certificationq12023.htm | 10547 | 2023-04-27 19:36:35 |
| ex312certificationq12023.htm | 10388 | 2023-04-27 19:36:35 |
| ex321certificationq12023.htm | 4843 | 2023-04-27 19:36:35 |
| ex322certificationq12023.htm | 4810 | 2023-04-27 19:36:35 |
| FilingSummary.xml | 24447 | 2023-04-27 19:36:35 |
| Financial_Report.xlsx | 67207 | 2023-04-27 19:36:35 |
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| nwe-20230331.htm | 1806305 | 2023-04-27 19:36:35 |
| nwe-20230331.xsd | 37212 | 2023-04-27 19:36:35 |
| nwe-20230331_cal.xml | 88724 | 2023-04-27 19:36:35 |
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| nwe-20230331_lab.xml | 499965 | 2023-04-27 19:36:35 |
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| R1.htm | 51539 | 2023-04-27 19:36:35 |
| R10.htm | 73415 | 2023-04-27 19:36:35 |
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| R2.htm | 72010 | 2023-04-27 19:36:35 |
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| R27.htm | 50594 | 2023-04-27 19:36:35 |
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| R8.htm | 24917 | 2023-04-27 19:36:35 |
| R9.htm | 38930 | 2023-04-27 19:36:35 |
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