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Business Segment Data - Class of Similar Products Which Represented Approximately 10% or More of Company's Consolidated Net Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 27, 2014 | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 413,412 | $ 514,544 | $ 541,249 | $ 359,812 | $ 386,369 | $ 459,446 | $ 497,602 | $ 307,320 | $ 1,829,017 | $ 1,650,737 | $ 1,604,357
Other pet products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 689,300 | 594,700 | 774,200
Garden controls and fertilizer products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 298,800 | 286,300 | 262,500
Wild bird feed [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 183,600 | 193,200 | 202,100
Grass seed [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 183,100
Other garden supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 331,300 | 343,500 | $ 182,500
Dog and cat products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 326,000 | $ 233,000 |

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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