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Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 25, 2010 | Sep. 25, 2010 | Jun. 26, 2010 | Mar. 27, 2010 | Dec. 31, 2011 | Dec. 25, 2010 | Dec. 26, 2009
Quarterly Financial Information (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 491,384 |  | $ 585,809 |  | $ 652,923 |  | $ 687,681 |  | $ 526,901 |  | $ 507,240 |  | $ 540,388 |  | $ 485,268 |  |  |  |
Gross profit | 63,442 | [1] | 61,825 | [1] | 79,046 | [1] | 97,807 | [1] | 69,380 | [1] | 69,643 | [1] | 73,743 | [1] | 72,220 | [1] |  |  |
Consolidated net income | 13,072 |  | 10,741 |  | 22,731 |  | 40,542 | [2] | 17,952 |  | 18,747 |  | 16,037 |  | 34,799 | [3] | 87,086 | 87,535 | 5,337
Net income attributable to Mueller Industries, Inc. | 12,928 |  | 10,475 |  | 22,331 |  | 40,587 |  | 17,746 |  | 18,909 |  | 15,558 |  | 33,958 |  | 86,321 | 86,171 | 4,675
Basic earnings per share (in dollars per share) | $ 0.34 |  | $ 0.28 |  | $ 0.59 |  | $ 1.08 |  | $ 0.47 |  | $ 0.50 |  | $ 0.41 |  | $ 0.90 |  | $ 2.28 | $ 2.29 | $ 0.13
Diluted earnings per share (in dollars per share) | $ 0.34 |  | $ 0.27 |  | $ 0.59 |  | $ 1.07 |  | $ 0.47 |  | $ 0.50 |  | $ 0.41 |  | $ 0.90 |  | $ 2.26 | $ 2.28 | $ 0.12
Dividends per share (in dollars per share) | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.10 |  | $ 0.40 | $ 0.40 | $ 0.40
After tax Insurance settlement |  |  |  |  |  |  | 6,800 |  |  |  |  |  |  |  | 23,300 |  | 0 | 22,736 | 0
Impairment charges, primarily goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 29,755
[1] | Gross profit is net sales less cost of goods sold, which excludes depreciation and amortization.
[2] | First quarter of 2011 includes gain from litigation settlement of $6.8 million after tax.
[3] | First quarter of 2010 includes gain from insurance settlement of $23.3 million after tax.

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