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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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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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