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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - UNAUDITED (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Costs and Expenses |  |  |  |
Net charges (benefits) | $ (1,872) | $ (1,683) | $ (3,919) | $ (3,382)
ASU 2017-07 Member] | Operating and Administrative Expenses [Member] |  |  |  |
Costs and Expenses |  |  |  |
Net charges (benefits) |  | 2,000 |  | 3,900
ASU 2017-07 Member] | Interest and Other Income [Member] |  |  |  |
Costs and Expenses |  |  |  |
Net charges (benefits) | $ (2,100) | $ (2,000) | $ (4,500) | $ (3,900)

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