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Income Taxes (Details 2)		12 Months Ended
	Dec. 31, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory rate	35.00%	21.00%	26.90%	35.00%
State income taxes, net of federal income tax benefit		1.40%	1.30%	1.30%
International rate differential		0.30%	(0.80%)	(1.80%)
Compensation and fringe benefits (1)		(6.40%)	(3.50%)	(24.30%)
Provisional transition tax		(0.70%)	2.20%	0.00%
Deferred tax remeasurement		0.00%	(0.80%)	0.00%
Other differences		0.50%	0.40%	0.20%
Effective Income Tax Rate Reconciliation, Percent		16.10%	25.70%	10.40%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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