Intangibles (Schedule of Intangible Assets) (Details) $ in Thousands	3 Months Ended
	Jul. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 28,583
Net Carrying Amount	$ 255,417
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 274,000
Accumulated Amortization	26,639
Net Carrying Amount	$ 247,361
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	3 years
Cost	$ 10,000
Accumulated Amortization	1,944
Net Carrying Amount	$ 8,056