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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Costs and Expenses
Net charges (benefits)	$ (2,047)	$ (1,699)
ASU 2017-07 Member] | Operating and Administrative Expenses [Member]
Costs and Expenses
Net charges (benefits)		1,900
ASU 2017-07 Member] | Interest and Other Income [Member]
Costs and Expenses
Net charges (benefits)	$ (2,400)	$ (1,900)

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