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 $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 29, 2012
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 374,238 $ 437,987 $ 501,611 $ 290,521 $ 368,837 $ 494,130 $ 498,169 $ 292,497 $ 1,604,357 $ 1,653,633 $ 1,700,013
Gross profit 107,556 119,131 147,596 79,741 81,307 152,466 153,170 76,959 454,024 463,902 514,158
Net income (loss) attributable to Central Garden & Pet Company $ (4,070) $ 4,687 $ 20,895 $ (12,708) $ (22,581) $ 13,725 $ 22,196 $ (15,269) $ 8,804 $ (1,929) $ 21,173
Net income (loss) per share:                      
Basic $ (0.08) $ 0.10 $ 0.43 $ (0.26) $ (0.47) $ 0.28 $ 0.46 $ (0.32) $ 0.18 $ (0.04) $ 0.44
Diluted $ (0.08) $ 0.09 $ 0.43 $ (0.26) $ (0.47) $ 0.28 $ 0.46 $ (0.32) $ 0.18 $ (0.04) $ 0.44
Weighted average common shares outstanding:                      
Basic 49,324 49,148 48,688 48,368 48,264 48,173 48,064 47,871 48,880 48,094 47,622
Diluted 49,324 49,841 49,116 48,368 48,264 48,822 48,740 47,871 49,397 48,094 48,374