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Income Taxes (Schedule Of Reconciliation Of Income Tax Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
U.S. Statutory federal income tax expense $ (38.3) $ (10.9) $ 3.2
Permanent items 16.1 2.7 9.9
Goodwill impairment 22.6    
Foreign statutory rate vs. U.S. statutory rate (0.2) (18.8) (14.9)
State income taxes, net of federal effect (1.9) 2.4 12.2
Tax reform act - US rate change (166.7)    
Tax reform act - mandatory repatriation 73.1    
Residual tax on foreign earnings 5.8 (4.0) 8.3
Benefit from adjustment to tax basis in assets   (8.5)
Change in valuation allowance (363.8) 81.5 (65.0)
Unrecognized tax expense 2.1 4.0 5.6
Foreign tax law changes   (3.7)
Share based compensation adjustments (7.4) (4.8) 0.5
Impact of IRC Section 9100 relief   (16.4)
Research and development tax credits (1.5) (6.6)  
Outside basis difference 4.6 6.4
Return to provision adjustments and other, net (0.6) (12.0) 4.0
Income tax (benefit) expense (460.7) 38.1 (58.4)
SB/RH [Member]      
U.S. Statutory federal income tax expense 2.3 59.6 82.9
Permanent items 5.0 (1.3) 6.1
Goodwill impairment 22.6    
Foreign statutory rate vs. U.S. statutory rate (0.2) (18.8) (14.9)
State income taxes, net of federal effect (0.9) 2.5 4.6
Tax reform act - US rate change (181.7)    
Tax reform act - mandatory repatriation 73.1    
Residual tax on foreign earnings 5.8 (4.0) 8.3
Benefit from adjustment to tax basis in assets     (8.5)
Change in valuation allowance 1.5 22.5 (102.1)
Unrecognized tax expense 2.1 4.0 5.5
Foreign tax law changes     (3.7)
Share based compensation adjustments (2.4) (0.3) 1.1
Impact of IRC Section 9100 relief     (16.4)
Research and development tax credits (1.5) (6.6)  
Return to provision adjustments and other, net (0.5) (16.3) (1.9)
Income tax (benefit) expense $ (74.8) $ 41.3 $ (39.0)