Intangibles (Schedule of Intangible Assets) (Details) $ in Thousands	6 Months Ended
	Oct. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 40,834
Net Carrying Amount	$ 243,166
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 274,000
Accumulated Amortization	38,056
Net Carrying Amount	$ 235,944
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	3 years
Cost	$ 10,000
Accumulated Amortization	2,778
Net Carrying Amount	$ 7,222