Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Unaudited - Schedule of Quarterly Financial Data - Unaudited (Detail)

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Quarterly Financial Data - Unaudited - Schedule of Quarterly Financial Data - Unaudited (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 386,369 $ 459,446 $ 497,602 $ 307,320 $ 374,238 $ 437,987 $ 501,611 $ 290,521 $ 1,650,737 $ 1,604,357 $ 1,653,633
Gross profit 107,972 142,037 150,062 87,981 107,556 119,131 147,596 79,741 488,052 454,024 463,902
Net income (loss) attributable to Central Garden & Pet Company $ (4,369) $ 18,800 $ 23,237 $ (5,697) $ (4,070) $ 4,687 $ 20,895 $ (12,708) $ 31,971 $ 8,804 $ (1,929)
Net income (loss) per share:                      
Basic $ (0.09) $ 0.39 $ 0.48 $ (0.12) $ (0.08) $ 0.10 $ 0.43 $ (0.26) $ 0.66 $ 0.18 $ (0.04)
Diluted $ (0.09) $ 0.38 $ 0.47 $ (0.12) $ (0.08) $ 0.09 $ 0.43 $ (0.26) $ 0.64 $ 0.18 $ (0.04)
Weighted average common shares outstanding:                      
Basic 48,322 48,167 48,384 49,379 49,324 49,148 48,688 48,368 48,562 48,880 48,094
Diluted 48,322 49,290 49,439 49,379 49,324 49,841 49,116 48,368 49,638 49,397 48,094