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Income Taxes
 6 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
The components of loss from continuing operations before income taxes are as follows (dollars in thousands):
 
Three Months Ended March 31,
 
Six Months Ended March 31,
2019
 
2018
 
2019
 
2018
Domestic
$
(35,351
)
 
$
(80,758
)
 
$
(15,563
)
 
$
(119,867
)
Foreign
13,644

 
(84,390
)
 
12,541

 
(76,785
)
Loss before income taxes
$
(21,707
)
 
$
(165,148
)
 
$
(3,022
)
 
$
(196,652
)
The components of (benefit) provision for income taxes are as follows (dollars in thousands):
 
Three Months Ended March 31,
 
Six Months Ended March 31,
2019
 
2018
 
2019
 
2018
Domestic
$
(5,272
)
 
$
6,989

 
$
(5,719
)
 
$
(90,143
)
Foreign
4,314

 
(4,996
)
 
5,747

 
13,167

(Benefit) provision for income taxes
$
(958
)
 
$
1,993

 
$
28

 
$
(76,976
)
Effective tax rate
4.4
%
 
(1.2
)%
 
(0.9
)%
 
39.1
%


The effective tax rates were estimated based upon estimated income for the year, the composition of the income in different countries, changes relating to valuation allowances for certain countries if and as necessary, and adjustments, if any, for the potential tax consequences, benefits or resolutions of audits or other tax contingencies. Our aggregate income tax rate in foreign jurisdictions is lower than our income tax rate in the United States; the majority of our income before provision for income taxes from foreign operations has been earned by subsidiaries in Ireland. Our effective tax rate may be adversely affected by earnings being lower than anticipated in countries where we have lower statutory tax rates and higher than anticipated in countries where we have higher statutory tax rates.

Our effective income tax rate was 4.4% for the three months ended March 31, 2019, compared to (1.2)% for the three months ended March 31, 2018. The effective tax rates for the three months ended March 31, 2019 and March 31, 2018 differed from the U.S. federal statutory rates of 21.0% and 24.53%, respectively, primarily due to the valuation allowance related to losses in the United States.

Our effective income tax rate was (0.9)% for the six months ended March 31, 2019, compared to 39.1% for the six months ended March 31, 2018. The effective tax rates for the six months ended March 31, 2019 and March 31, 2018 differed from the U.S. federal statutory rates of 21.0% and 24.53%, respectively, primarily due to the valuation allowance related to losses in the United States. Additionally, for the six months ended March 31, 2018, we recognized approximately $87 million of deferred tax benefit from the remeasurement of deferred tax assets and liabilities offset by approximately $2 million estimated tax provision for deemed repatriated foreign earnings as a result of the Tax Cuts and Jobs Act ("TCJA") enacted in December 2017.