Fair Value Measurements (Schedule Of Non-Recurring Losses Recognized Using Fair Value Measurements And The Carrying Value Of Any Assets And Liabilities Measured Using Fair Value Estimates) (Details) - Fair Value, Measurements, Nonrecurring - Net assets of acquired businesses - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Assets
Assets, carrying value	$ 117,588	$ 2,650
Assets, non-recurring losses (gains)	$ 0	$ 0