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Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Selected Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales | $ 177,608 | $ 262,524 | $ 785,139 | $ 516,525 | $ 174,046 | $ 232,476 | $ 629,592 | $ 461,474 | $ 1,741,796 |  | $ 1,497,588 |  | $ 1,591,310 |
Gross profit for product, installation and service | 33,519 | 54,907 | 162,011 | 102,691 | 32,783 | 46,550 | 125,994 | 92,450 | 353,128 |  | 297,777 |  |  |
Operating income (loss) | (19,800) | (8,001) | 75,229 | 18,577 | (6,586) | (18,525) | 74,077 | 9,293 | 66,005 |  | 58,259 |  | 66,861 |
Income (loss) before income taxes | (23,686) | (11,952) | 70,796 | 14,669 | (10,457) | (22,434) | 69,873 | 5,583 | 49,827 |  | 42,565 |  | 47,067 |
Net income (loss) | (13,937) | (7,588) | 41,679 | 9,752 | (5,635) | (11,789) | 40,482 | 2,931 | 29,906 |  | 25,989 |  | 24,344 |
Limited Partner interest in net income (loss) | $ (13,859) | $ (7,547) | $ 41,454 | $ 9,699 | $ (5,605) | $ (11,727) | $ 40,269 | $ 2,916 | $ 29,747 |  | $ 25,853 |  | $ 24,229 |
Net income (loss) per Limited Partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ (0.24) | $ (0.13) | $ 0.58 | $ 0.15 | $ (0.09) | $ (0.19) | $ 0.55 | $ 0.05 | $ 0.47 | [1] | $ 0.40 | [1] | $ 0.35 | [1]
[1] | See Note 17 Earnings Per Limited Partner Units.

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