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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]        
Net gain related to deferred tax liability $ 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 3,236    
Unrecognized tax benefits $ 10,827 $ 9,874 $ 3,651 $ 4,084