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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring $ in Millions | 9 Months Ended
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Jun. 30, 2018 USD ($)
Fiscal 2017 charges: |
Restructuring Reserve [Roll Forward] |
Balance as of September 30, 2017 | $ 11.5
Fiscal 2017 charges: | Fiscal 2018 Actions |
Restructuring Reserve [Roll Forward] |
Balance as of September 30, 2017 | 0.0
Fiscal 2017 charges: | Fiscal 2017 Actions |
Restructuring Reserve [Roll Forward] |
Balance as of September 30, 2017 | 7.5
Fiscal 2017 charges: | Fiscal 2016 Actions |
Restructuring Reserve [Roll Forward] |
Balance as of September 30, 2017 | 3.7
Fiscal 2017 charges: | Other |
Restructuring Reserve [Roll Forward] |
Balance as of September 30, 2017 | 0.3
Fiscal 2018 charges: |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 11.4
Stock-based compensation | (1.3)
Severance payments and adjustments | (8.7)
Other payments | (1.1)
Balance as of June 30, 2018 | 11.8
Fiscal 2018 charges: | Fiscal 2018 Actions |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 9.8
Stock-based compensation | (1.3)
Severance payments and adjustments | (3.5)
Other payments | 0.0
Balance as of June 30, 2018 | 5.0
Fiscal 2018 charges: | Fiscal 2017 Actions |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 0.0
Stock-based compensation | 0.0
Severance payments and adjustments | (5.0)
Other payments | 0.0
Balance as of June 30, 2018 | 2.5
Fiscal 2018 charges: | Fiscal 2016 Actions |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 1.6
Stock-based compensation | 0.0
Severance payments and adjustments | (0.2)
Other payments | (0.9)
Balance as of June 30, 2018 | 4.2
Fiscal 2018 charges: | Other |
Restructuring Reserve [Roll Forward] |
Fiscal 2018 charges | 0.0
Stock-based compensation | 0.0
Severance payments and adjustments | 0.0
Other payments | (0.2)
Balance as of June 30, 2018 | $ 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 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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