CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018
CONSOLIDATED STATEMENTS OF INCOME
Revenue from Related Parties	$ 55,407	$ 29,594
Tax expense	$ 2,444

Amount of tax (expense) benefit on (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a discontinued operation.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration