Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.19.1
Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2017
Sep. 30, 2018
Income Tax Expense (Benefit) [Line Items]      
Corporate income tax rate 21.00% 35.00%  
Valuation allowance $ 1.6    
Alternative Minimum Tax [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     $ 0.5
Foreign Tax Authority [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     62.3
Federal [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     33.2
Federal [Member] | 2022 to 2037 [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     14.4
Federal [Member] | Indefinite [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     18.8
State [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     36.2
State [Member] | 2022 to 2037 [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     19.6
State [Member] | Indefinite [Member]      
Income Tax Expense (Benefit) [Line Items]      
Operating loss carryforwards     $ 16.6