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Restructuring Charges (Tables)
 6 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Charges Taken Related to Restructuring Actions
The following table displays charges related to these actions recorded in the fiscal 2018 year to date period (six months ended March 31, 2018) and fiscal 2017 (the year ended September 30, 2017) and a rollforward of the accrued balances from September 30, 2017 to March 31, 2018:
 
 
Fiscal 2018 Actions
 
Fiscal 2017 Actions
 
Fiscal 2016 Actions
 
Total    
Restructuring Charges
 
 
 
 
 
 
 
 
Fiscal 2017 charges:
 
 
 
 
 
 
 

Workforce reductions
 
$
—

 
$
8.5

 
$
—

 
$
8.5

Facility closure costs
 
—

 
—

 
4.8

 
4.8

Fiscal 2017 restructuring charges
 
$
—

 
$
8.5

 
$
4.8

 
$
13.3

Fiscal 2018 charges:
 
 
 
 
 
 
 
 
Workforce reductions
 
$
5.6

 
$
—

 
$
—

 
$
5.6

Fiscal 2018 restructuring charges
 
$
5.6

 
$
—

 
$
—

 
$
5.6
Charges Taken Related to Accrued Restructuring Actions
 
 
Fiscal 2018 Actions
 
Fiscal 2017 Actions
 
Fiscal 2016 Actions
 
Other
 
Total    
Rollforward of Accrued Restructuring
 
 
 
 
 
 
 
 
 
 
Balance as of September 30, 2017
 
$
—

 
$
7.5

 
$
3.7

 
$
0.3

 
$
11.5

Fiscal 2018 charges
 
5.6

 
—

 
—

 
—

 
5.6

Stock-based compensation
 
(1.3
)
 
—

 
—

 
—

 
(1.3
)
Severance payments and adjustments
 
(3.0
)
 
(4.6
)
 
(0.2
)
 
—

 
(7.8
)
Other payments
 
—

 
—

 
(0.6
)
 
(0.2
)
 
(0.8
)
Balance as of March 30, 2018
 
$
1.3

 
$
2.9

 
$
2.9

 
$
0.1

 
$
7.2