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Income Taxes - Summary of Changes to Unrecognized Tax Benefits Reserves Excluding Related Interest and Penalties (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 47.9 | $ 16.1 | $ 12.6 | $ 13.8
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 29.9 | 4.7 | 2.7 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 2.3 | 1.9 | 1.4 |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 4.8 | 1.8 | 0.8 |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 0.6 | 0.8 | 2.5 |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | $ 0.0 | $ 0.3 | $ 0.8 |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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