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Restructuring and related charges - Summarization of Restructuring and Related Charges (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 15.2 | $ 28.7 | $ 22.9
Consumer products cost of goods sold classification |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0.5 | 2.1 | 3.7
Selling, acquisition, operating and general expenses classification |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 14.7 | 26.6 | 19.2
Global Cost Reduction Initiatives |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 5.2 | $ 17.1 | 13.4
Total Projected Costs | 20.0 |  |
Expected Completion Date |  | Sep. 30, 2017 |
HHI Business Rationalization Initiatives [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 1.8 | $ 10.3 | 4.5
Expected Completion Date |  | Sep. 30, 2016 |
Global Expense Rationalization Initiatives |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 5.3 | $ 0.0 | 0.0
Expected Completion Date |  | Sep. 30, 2016 |
Other initiatives |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 2.9 | $ 1.3 | $ 5.0

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- Definition Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format. + References Reference 1: 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(a)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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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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