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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
--- | --- | ---
Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 27, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 26, 2015 | Sep. 27, 2014 | Sep. 28, 2013
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 386,369 | $ 459,446 | $ 497,602 | $ 307,320 | $ 374,238 | $ 437,987 | $ 501,611 | $ 290,521 | $ 1,650,737 | $ 1,604,357 | $ 1,653,633
Pet supplies (excluding wild bird feed) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 827,700 | 774,200 | 807,400
Garden controls and fertilizer products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 286,300 | 262,500 | 274,900
Wild bird feed [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 193,200 | 202,100 | 210,800
Other garden supplies [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 181,400 | 182,500 | 183,500
Grass seed [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 162,100 | $ 183,100 | $ 177,000

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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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