Intangibles (Schedule of Intangible Assets) (Details) $ in Thousands	9 Months Ended
	Jan. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 4,084
Net Carrying Amount	$ 279,916
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 274,000
Accumulated Amortization	3,806
Net Carrying Amount	$ 270,194
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	3 years
Cost	$ 10,000
Accumulated Amortization	278
Net Carrying Amount	$ 9,722