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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.