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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]        
Net gain $ 267,000      
Net gain related to the lower blended tax rate 3,200      
Net gain 270,200      
Repatriation charge 1,900      
Long-term deferred tax assets 1,000 $ 1,000    
Valuation allowance 609 3,437    
Decrease in valuation allowance 2,800      
Unrecognized tax benefits $ 10,827 $ 3,651 $ 4,084 $ 3,420
Effective income tax rate, change in enacted tax rate 10.10% 3.30% 2.60%