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Goodwill - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Goodwill [Roll Forward] |  |  |  |
Goodwill | $ 699,516 | $ 695,638 | $ 690,738 | $ 665,836
Accumulated impairment losses | (409,561) | (409,561) | (409,561) | (409,561)
Balance as of beginning of period | 286,077 | 281,177 | 256,275 |
Additions in fiscal year | 3,878 | 4,900 | 24,902 |
Write off related to sale of business |  |  | 0 |
Balance as of end of period | 289,955 | 286,077 | 281,177 |
Garden Products Segment |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill | 231,371 | 231,371 | 226,471 | 219,056
Accumulated impairment losses | (213,583) | (213,583) | (213,583) | (213,583)
Balance as of beginning of period | 17,788 | 12,888 | 5,473 |
Additions in fiscal year | 0 | 4,900 | 7,415 |
Write off related to sale of business |  |  | 0 |
Balance as of end of period | 17,788 | 17,788 | 12,888 |
Pet Products Segment |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill | 468,145 | 464,267 | 464,267 | 446,780
Accumulated impairment losses | (195,978) | (195,978) | (195,978) | $ (195,978)
Balance as of beginning of period | 268,289 | 268,289 | 250,802 |
Additions in fiscal year | 3,878 | 0 | 17,487 |
Write off related to sale of business |  |  | 0 |
Balance as of end of period | $ 272,167 | $ 268,289 | $ 268,289 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121556970&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556970&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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