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Restructuring and related charges - Summarization of Restructuring and Related Charges (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 23.2 | $ 8.0 | $ 43.6 | $ 10.2
Selling, acquisition, operating and general expenses classification |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 23.2 | 8.0 | 43.6 | 10.2
Global Cost Reduction Initiatives |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 3.1 | 5.5 | 28.8 | 1.2
Global Expense Rationalization Initiatives |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Projected Costs | 41.0 |  | 41.0 |
HHI Distribution Center Consolidation [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 13.6 | 1.2 | 7.1 | 7.0
Total Projected Costs | 67.0 |  | 67.0 |
Pet Rightsizing Initiative [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | 3.4 | 0.6 | 4.0 | 0.6
Total Projected Costs | 13.0 |  | 13.0 |
Other initiatives |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges | $ 3.1 | $ 0.7 | $ 3.7 | $ 1.4

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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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