Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Quarterly Financial Data - Unaudited - Schedule of Quarterly Financial Data - Unaudited (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
JointVenture
$ / shares
shares
Jun. 24, 2017
USD ($)
$ / shares
shares
Mar. 25, 2017
USD ($)
$ / shares
shares
Dec. 24, 2016
USD ($)
$ / shares
shares
Sep. 24, 2016
USD ($)
JointVenture
$ / shares
shares
Jun. 25, 2016
USD ($)
$ / shares
shares
Mar. 26, 2016
USD ($)
$ / shares
shares
Dec. 26, 2015
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
JointVenture
$ / shares
shares
Sep. 24, 2016
USD ($)
JointVenture
$ / shares
shares
Sep. 26, 2015
USD ($)
$ / shares
shares
Segment Reporting Information [Line Items]                      
Net sales $ 490,464 $ 574,592 $ 569,924 $ 419,498 $ 413,412 $ 514,544 $ 541,249 $ 359,812 $ 2,054,478 $ 1,829,017 $ 1,650,737
Gross profit 145,328 183,273 183,529 120,678 120,180 163,745 169,339 99,786 632,808 553,050 488,052
Net income (loss) attributable to Central Garden & Pet Company $ 4,259 $ 32,248 $ 34,684 $ 7,637 $ (5,611) $ 26,030 $ 32,697 $ (8,602) $ 78,828 $ 44,514 $ 31,971
Net income per share:                      
Basic (in usd per share) | $ / shares $ 0.08 $ 0.64 $ 0.69 $ 0.15 $ (0.11) $ 0.53 $ 0.67 $ (0.18) $ 1.57 $ 0.91 $ 0.66
Diluted (in usd per share) | $ / shares $ 0.08 $ 0.62 $ 0.67 $ 0.15 $ (0.11) $ 0.51 $ 0.65 $ (0.18) $ 1.52 $ 0.87 $ 0.64
Weighted average common shares outstanding:                      
Basic (in shares) | shares 50,654 50,507 50,079 49,665 49,453 49,120 48,717 48,566 50,230 48,964 48,562
Diluted (in shares) | shares 51,935 51,825 51,983 51,810 49,453 51,063 50,445 48,566 51,820 51,075 49,638
Debt instrument, redemption, incremental expense               $ 14,300      
Debt instrument, redemption, incremental expense, call premium               8,300      
Debt instrument, redemption, incremental expense, overlapping interest expenses               $ 2,700      
Debt instrument, redemption, incremental expense, overlapping interest expenses, period               30 days      
Write-off of deferred financing costs               $ 3,300 $ 0 $ 3,337 $ 537
Non-cash impairment charge         $ 16,600       $ 0 $ 19,367 7,272
Number of joint ventures | JointVenture 2       2       2 2  
Non-cash impairment charge to indefinite-lived intangible assets         $ 1,800       $ 0 $ 1,800 $ 7,300
Garden segment                      
Weighted average common shares outstanding:                      
Gain on sale of manufacturing plant assets       $ 2,000              
Pet segment                      
Weighted average common shares outstanding:                      
Gain on sale of manufacturing plant assets           $ 2,400