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Quarterly Financial Information (Unaudited) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 29, 2012 | Dec. 31, 2011 | Dec. 25, 2010
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 504,006,000 |  | $ 514,165,000 |  | $ 594,099,000 |  | $ 577,668,000 |  | $ 491,384,000 |  | $ 585,809,000 |  | $ 652,923,000 |  | $ 687,681,000 |  |  |  |
Gross profit | 65,287,000 | [1] | 64,447,000 | [1] | 71,248,000 | [1] | 84,493,000 | [1] | 63,442,000 | [1] | 61,825,000 | [1] | 79,046,000 | [1] | 97,807,000 | [1] |  |  |
Consolidated net income | 16,746,000 |  | 15,570,000 |  | 18,540,000 |  | 32,817,000 | [2] | 13,072,000 |  | 10,741,000 |  | 22,731,000 |  | 40,542,000 | [3] | 83,673,000 | 87,086,000 | 87,535,000
Net income attributable to Mueller Industries, Inc. | 16,368,000 |  | 15,511,000 |  | 17,917,000 |  | 32,599,000 |  | 12,928,000 |  | 10,475,000 |  | 22,331,000 |  | 40,587,000 |  | 82,395,000 | 86,321,000 | 86,171,000
Basic earnings per share (in dollars per share) | $ 0.59 | [4] | $ 0.41 |  | $ 0.47 |  | $ 0.86 |  | $ 0.34 |  | $ 0.28 |  | $ 0.59 |  | $ 1.08 |  | $ 2.33 | $ 2.28 | $ 2.29
Diluted earnings per share (in dollars per share) | $ 0.58 | [4] | $ 0.41 |  | $ 0.47 |  | $ 0.85 |  | $ 0.34 |  | $ 0.27 |  | $ 0.59 |  | $ 1.07 |  | $ 2.31 | $ 2.26 | $ 2.28
Dividends per share (in dollars per share) | $ 0.125 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.425 | $ 0.40 | $ 0.40
After tax litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800,000 |  |  |  |
Effect of LIFO Inventory Liquidation on Income |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on insurance settlement |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased from Leucadia | 10.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Gross profit is net sales less cost of goods sold, which excludes depreciation and amortization.
[2] | Includes $8.0 million gain from liquidation of LIFO inventory layers and $1.5 million gain from settlement of insurance claims.
[3] | First quarter of 2011 includes gain from litigation settlement of $6.8 million after tax.
[4] | Includes the repurchase of 10.4 million shares from Leucadia in September 2012

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