XML 55 R33.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Adoption of Accounting Principles and Recently Issued Accounting Pronouncements | 12 Months Ended
--- | ---
Dec. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |
Adoption of Accounting Principles and Recently Issued Accounting Pronouncements | Adoption of Accounting Principles and Recently Issued Accounting Pronouncements - MGE Energy and MGE. a. Transfers and Servicing Assets. In June 2014, the FASB issued authoritative guidance within the Codification's Transfers and Servicing topic that provides guidance on the accounting and disclosures for repurchase-to-maturity transactions, securities lending transactions, and repurchase financings. This authoritative guidance became effective January 1, 2015. The authoritative guidance ch anged the accounting for the Chattel Paper program and required additional disclosures. Prior to adoption of the standard, Chattel Paper was treated as an off-balance sheet arrangement. See Footnote 1.h for additional information. b. Revenue from Contract s with Customers. In May 2014, the FASB issued authoritative guidance within the Codification's Revenue Recognition topic that provides guidance on the recognition, measurement, and disclosure of revenue from contracts with customers. This authoritative g uidance was scheduled to become effective January 1, 2017. In July 2015, the FASB deferred the effective date to January 1, 2018. MGE Energy and MGE are currently assessing the impact this pronouncement will have on their financial statements. c. Consolid ations. In February 2015, the FASB issued authoritative guidance within the Codification's Consolidation topic that provides guidance on the evaluation of certain legal entities for consolidation purposes. This authoritative guidance is effective January 1, 2016. The impact of this guidance on our financial statements is not expected to be material. d. Debt Issuance Costs. In April 2015, the FASB issued authoritative guidance within the Codification's Interest topic that provides guidance on the presenta tion of debt issuance costs in financial statements. This authoritative guidance is effective January 1, 2016. The authoritative guidance changes the presentation of debt issuance costs on the balance sheet from an asset to a direct deduction from the rela ted debt liability. The impact of this guidance on our financial statements is not expected to be material. e. Cloud Computing Arrangements. In April 2015, the FASB issued authoritative guidance within the Codification's Software topic that provides guid ance on the accounting treatment of cloud computer arrangements. This authoritative guidance is effective January 1, 2016. The authoritative guidance provides criteria for determining whether a cloud computing arrangement contains a software license that s hould be accounted for as internal-use software. The impact of this guidance on our financial statements is not expected to be material. f. Inventory Measurement. In July 2015, the FASB issued authoritative guidance within the Codification's Inventory topic that provides guidance on the subsequent measurement of inventory. This authoritative guidance will become effective January 1, 2017. The authoritative guidance changes the subsequent measurement of inventory from the lower of cost or market to the l ower of cost or net realizable value. MGE Energy and MGE are currently assessing the impact this pronouncement will have on their financial statements. g. Deferred Income Taxes. In November 2015, the FASB issued authoritative guidance within the Codification's Income Taxes topic that provides guidance on the presentation of deferred taxes in financial statements. This authoritative guidance will become effective January 1, 2017, a nd changes the presentation of deferred taxes on the consolidated balance sheets. The authoritative guidance states that earlier adoption of the ASU is permitted using either prospective or retrospective application. Prior to the authoritative guidance, de ferred taxes were presented as a net current asset or liability and net noncurrent asset or liability. As a result of the adoption of this standard, all deferred tax assets and liabilities, along with any related valuation allowance, will be classified as noncurrent on the consolidated balance sheets. MGE Energy and MGE have early adopted this standard for the year ended December 31, 2015, and retrospectively applied the guidance to all prior periods presented. See Footnote 12 for additional information.

X
- References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6507316 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Direct Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6510796 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Indirect Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6515603 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22580-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accounting Change -URI http://asc.fasb.org/extlink&oid=6503790 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Retrospective Application -URI http://asc.fasb.org/extlink&oid=6523989 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 + Details
Name: | us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration