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. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Jun. 24, 2017
Mar. 25, 2017
Dec. 24, 2016
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
Dec. 26, 2015
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Segment Reporting Information [Line Items]                          
Net sales     $ 502,314 $ 657,943 $ 613,094 $ 442,011 $ 490,464 $ 574,592 $ 569,924 $ 419,498 $ 2,215,362 $ 2,054,478 $ 1,829,017
Gross profit     147,018 202,064 194,457 131,837 145,328 183,273 183,529 120,678 675,376 632,808 553,050
Net income (loss) attributable to Central Garden & Pet Company     $ 10,568 $ 41,545 $ 45,234 $ 26,247 $ 4,259 $ 32,248 $ 34,684 $ 7,637 $ 123,594 $ 78,828 $ 44,514
Net income per share:                          
Basic (in usd per share)     $ 0.20 $ 0.81 $ 0.89 $ 0.52 $ 0.08 $ 0.64 $ 0.69 $ 0.15 $ 2.39 $ 1.57 $ 0.91
Diluted (in usd per share)     $ 0.19 $ 0.79 $ 0.86 $ 0.50 $ 0.08 $ 0.62 $ 0.67 $ 0.15 $ 2.32 $ 1.52 $ 0.87
Weighted average common shares outstanding:                          
Basic (in shares)     54,059 51,134 50,871 50,730 50,654 50,507 50,079 49,665 51,716 50,230 48,964
Diluted (in shares)     55,376 52,575 52,658 52,695 51,935 51,825 51,983 51,810 53,341 51,820 51,075
Provisional tax benefit $ 5,200 $ 16,300                 $ 21,500    
Garden segment                          
Weighted average common shares outstanding:                          
Gain on sale of a distribution facility           $ 2,000