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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring $ in Millions	9 Months Ended
	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

X

- Definition

Severance payments.

+ References

No definition available.

+ Details

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X

- 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

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X

- 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.

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