Intangibles, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Amortized intangible assets:
Gross Carrying Amount	$ 81,865	$ 80,298
Accumulated Amortization	(34,093)	(25,142)
Intangibles, net	47,772	55,156
Supply contracts and customer relationships
Amortized intangible assets:
Gross Carrying Amount	50,600	49,109
Accumulated Amortization	(16,780)	(11,900)
Intangibles, net	$ 33,820	$ 37,209
Useful life of intangible assets	8 years	9 years
Trade names
Amortized intangible assets:
Gross Carrying Amount	$ 23,635	$ 23,501
Accumulated Amortization	(10,075)	(8,010)
Intangibles, net	$ 13,560	$ 15,491
Useful life of intangible assets	6 years	7 years
Licenses and databases
Amortized intangible assets:
Gross Carrying Amount	$ 7,630	$ 7,688
Accumulated Amortization	(7,238)	(5,232)
Intangibles, net	$ 392	$ 2,456
Useful life of intangible assets	3 years	2 years