Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 30, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Magnetek, Inc. and its subsidiaries. All significant intercompany accounts and transactions have been eliminated. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 29, 2013, filed with the Securities and Exchange Commission (the “SEC”). In the Company's opinion, these unaudited statements contain all adjustments, consisting of normal recurring adjustments, necessary to present fairly the financial position of the Company as of March 30, 2014, and the results of its operations and cash flows for the three-month periods ended March 30, 2014, and March 31, 2013. Results for the three months ended March 30, 2014, are not necessarily indicative of results that may be experienced for the full fiscal year.
Fiscal Year	Fiscal Year The Company uses a 52 or 53 week fiscal year ending on the Sunday nearest December 31. Fiscal quarters are the 13 or 14 week periods ending on the Sunday nearest March 31, June 30, September 30, and December 31. The three-month periods ended March 30, 2014 and March 31, 2013 each contained 13 weeks.
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Evaluation of Subsequent Events	Evaluation of Subsequent Events The Company has evaluated subsequent events and transactions for potential recognition or disclosure in the financial statements through the date the financial statements were available to be issued, and has concluded that no recognized or non-recognized subsequent events have occurred since its fiscal quarter ended on March 30, 2014.

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

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