Income Taxes (Details 2)			12 Months Ended
Jul. 31, 2018	Dec. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory rate	21.00%	35.00%	26.90%	35.00%	35.00%
State income taxes, net of federal income tax benefit			1.30%	1.30%	0.90%
International rate differential			(0.80%)	(1.80%)	(1.80%)
Compensation and fringe benefits (1)			(3.50%)	(24.30%)	(3.60%)
Provisional transition tax			2.20%	0.00%	0.00%
Deferred tax remeasurement			(0.80%)	0.00%	0.00%
Other differences			0.40%	0.20%	1.20%
Effective Income Tax Rate Reconciliation, Percent			25.70%	10.40%	31.70%

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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the repatriation of foreign earnings.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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