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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Sep. 29, 2017
Income Tax [Line Items]      
Current Foreign Tax Expense (Benefit)   $ (4,200)  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 54    
Reptriation Of Foreign Earnings   $ 22,000  
Scenario, Forecast [Member]      
Income Tax [Line Items]      
Tax Expense Related To Uncertain Income Tax Positions     $ 500
Interest Included In Income Tax Expense     $ 250