Intangibles (Schedule of Intangible Assets) (Details) $ in Thousands	9 Months Ended
	Jan. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 53,083
Net Carrying Amount	$ 230,917
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 274,000
Accumulated Amortization	49,472
Net Carrying Amount	$ 224,528
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	3 years
Cost	$ 10,000
Accumulated Amortization	3,611
Net Carrying Amount	$ 6,389