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Goodwill - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Goodwill [Line Items] |  |  |  |
Goodwill | $ 665,836 | $ 640,946 | $ 618,650 | $ 617,794
Accumulated impairment losses | (409,561) | (409,561) | (409,561) | (409,561)
Total goodwill | 256,275 | 231,385 | 209,089 | 208,233
Additions in fiscal year | 25,890 | 22,296 | 856 |
Sale of business | (1,000) |  |  |
Garden Products Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 219,056 | 219,056 | 213,583 | 213,583
Accumulated impairment losses | (213,583) | (213,583) | (213,583) | (213,583)
Total goodwill | 5,473 | 5,473 | 0 | 0
Additions in fiscal year |  | 5,473 | 0 |
Pet Products Segment |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 446,780 | 421,890 | 405,067 | 404,211
Accumulated impairment losses | (195,978) | (195,978) | (195,978) | (195,978)
Total goodwill | 250,802 | 225,912 | 209,089 | $ 208,233
Additions in fiscal year | 25,890 | $ 16,823 | $ 856 |
Sale of business | $ (1,000) |  |  |

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- Definition Goodwill acquisitions purchase price and purchase accounting adjustments. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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