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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
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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 |  |  |  |  |

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