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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | May 06, 2017
Business Acquisition [Line Items] |  |  |  |
Goodwill (Note 12) | $ 2,626.0 | $ 2,478.4 | $ 2,487.4 |
Estimated Income tax rate | 35.00% |  |  |
Cash consideration | $ 304.7 |  | 1,309.9 |
FGL [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage Of Ownership Interest | 80.40% |  |  | 50.00%
HGI |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition related charges | $ 0.0 | $ 0.2 | $ 0.4 |
Technology Assets [Member] | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization period, intangible asset | 4 years |  |  |
Technology Assets [Member] | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization period, intangible asset | 18 years |  |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization period, intangible asset | 2 years |  |  |
Customer Relationships [Member] | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization period, intangible asset | 20 years |  |  |
Petmatrix LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill (Note 12) | $ 0.8 |  |  |
Property, plant and equipment | 0.9 |  |  |
Goodwill (Note 12) | 123.8 |  |  |
Inventory | 16.0 |  |  |
Business Combination, Consideration Transferred | 255.2 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 255.2 |  |  |
Petmatrix LLC [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 16 years |  |  |
Estimated Income tax rate | 35.00% |  |  |
Goodwill (Note 12) | $ 12.0 |  |  |
Business Acquisition Contingent Consideration Key Assumptions Discount Rate | 12.00% |  |  |
Petmatrix LLC [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate | 2.00% |  |  |
Petmatrix LLC [Member] | Customer Relationships [Member] | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair Value Inputs, Long-term Revenue Growth Rate | 20.00% |  |  |
Retention Rate | 98.00% |  |  |
Petmatrix LLC [Member] | Tradenames Trademarks And Patents [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill (Note 12) | $ 75.0 |  |  |
GloFish [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill (Note 12) | 11.2 |  |  |
Property, plant and equipment | 0.6 |  |  |
Goodwill (Note 12) | 37.8 |  |  |
Business Combination, Consideration Transferred | 49.7 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 49.7 |  |  |
GloFish [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |
Estimated Income tax rate | 35.00% |  |  |
Goodwill (Note 12) | $ 1.5 |  |  |
Business Acquisition Contingent Consideration Key Assumptions Discount Rate | 12.00% |  |  |
GloFish [Member] | Tradenames Trademarks And Patents [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill (Note 12) | $ 6.1 |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 + 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=64834752&loc=SL49117168-202975 + Details
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