Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018	Oct. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 27,616
Accumulated Amortization	(13,126)
Net	(14,490)			$ (14,939)
Amortization of Intangible Assets	(521)	$ (565)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			13 years 2 months 14 days
Cost	17,565
Accumulated Amortization	(7,586)
Net	(9,979)			(10,311)
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years 3 months 1 day
Cost	7,186
Accumulated Amortization	(3,860)
Net	(3,326)			(3,404)
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			2 years 3 months 14 days
Cost	824
Accumulated Amortization	(813)
Net	(11)			(15)
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			14 years 9 months 14 days
Cost	1,875
Accumulated Amortization	(775)
Net	(1,100)			(1,131)
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			10 years 14 days
Cost	166
Accumulated Amortization	(92)
Net	$ (74)			$ (78)