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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 2,600	$ 3,500	$ 5,500	$ 7,400
Amortized intangibles:
Accumulated amortization	(20,220)		(20,220)		$ (42,025)
Net intangibles	60,265		60,265		64,892
Intangible Assets, Explanation of Significant Deletions			28,000
Supply contracts & customer relationships
Amortized intangibles:
Gross carrying amount	49,206		49,206		71,787
Trade name
Amortized intangibles:
Gross carrying amount	23,573		23,573		24,173
Licenses and databases
Amortized intangibles:
Gross carrying amount	7,706		7,706		9,291
Covenants not to compete
Amortized intangibles:
Gross carrying amount	$ 0		$ 0		$ 1,666

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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