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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring $ in Millions | 6 Months Ended
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Mar. 31, 2018 USD ($)
Two Thousand Seventeen [Member] |
Restructuring Reserve [Roll Forward] |
Period beginning balance | $ 11.5
Two Thousand Seventeen [Member] | Fiscal 2018 Action [Member] |
Restructuring Reserve [Roll Forward] |
Period beginning balance | 0.0
Two Thousand Seventeen [Member] | Fiscal 2017 Actions [Member] |
Restructuring Reserve [Roll Forward] |
Period beginning balance | 7.5
Two Thousand Seventeen [Member] | Fiscal 2016 Actions |
Restructuring Reserve [Roll Forward] |
Period beginning balance | 3.7
Two Thousand Seventeen [Member] | Other Restructuring [Member] |
Restructuring Reserve [Roll Forward] |
Period beginning balance | 0.3
Two thousand eighteen [Member] |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 5.6
Stock-based compensation | (1.3)
Severance payments and adjustments | (7.8)
Other payments | (0.8)
Period end balance | 7.2
Two thousand eighteen [Member] | Fiscal 2018 Action [Member] |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 5.6
Stock-based compensation | (1.3)
Severance payments and adjustments | (3.0)
Other payments | 0.0
Period end balance | 1.3
Two thousand eighteen [Member] | Fiscal 2017 Actions [Member] |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 0.0
Stock-based compensation | 0.0
Severance payments and adjustments | (4.6)
Other payments | 0.0
Period end balance | 2.9
Two thousand eighteen [Member] | Fiscal 2016 Actions |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 0.0
Stock-based compensation | 0.0
Severance payments and adjustments | (0.2)
Other payments | (0.6)
Period end balance | 2.9
Two thousand eighteen [Member] | Other Restructuring [Member] |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 0.0
Stock-based compensation | 0.0
Severance payments and adjustments | 0.0
Other payments | (0.2)
Period end balance | $ 0.1

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- Definition Severance payments. + References No definition available. + Details
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- Definition Payments to settle other restructuring charges. + References No definition available. + Details
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- Definition Restructuring charges, gross + References No definition available. + Details
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- Definition Share based compensation expense included other restructuring costs. + References No definition available. + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + 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(b)) -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 (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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