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v3.19.1

Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2017 | May 18, 2017 | May 12, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Par value |  |  |  | $ 0.01 | $ 0.01 |
General and administrative expenses |  |  |  | $ 350.7 | $ 355.2 | $ 286.4
Spectrum Merger [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
General and administrative expenses |  |  |  | $ 45.9 | $ 7.6 |
PetMatrix [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  |  | Jun. 01, 2017 |
Estimated income tax rate | 35.00% |  |  |  |  |
Discounted rate | 12.00% |  |  |  |  |
Purchase price | $ 255.2 |  |  |  |  |
PetMatrix [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Expected growth rate | 2.00% |  |  |  |  |
PetMatrix [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Expected growth rate | 20.00% |  |  |  |  |
Customer retention rate | 98.00% |  |  |  |  |
GloFish [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  |  | May 12, 2017 |
Estimated income tax rate |  |  | 35.00% |  |  |
Discounted rate |  |  | 12.00% |  |  |
Purchase price |  |  | $ 49.7 |  |  |
Shaser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of remaining non-controlling interest purchased |  | 44.00% |  |  |  |
Purchase price |  | $ 12.6 |  |  |  |
Increase to additional paid-in capital |  | $ 24.1 |  |  |  |

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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