Reconciliation of Income Taxes at United States Rate to Effective Tax Rate (Detail)	3 Months Ended	9 Months Ended
Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Reconciliation of Statutory Federal Tax Rate [Line Items]
U.S. Federal statutory tax rate	35.00%	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit			(5.00%)	(1.00%)
Domestic production benefit				(2.00%)
General business credit (U.S. R&D)			(11.00%)	(2.00%)
Valuation allowance			3.00%	1.00%
Effect of international operations			(1.00%)	(12.00%)
Increase (Decrease) in tax reserves			24.00%	(10.00%)
Other items, net			1.00%	1.00%
Effective tax rate	26.00%	(16.00%)	46.00%	10.00%

Effective Income Tax Rate Reconciliation, Increase (Decrease), in Tax Reserves

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Effective Income Tax Rate Reconciliation Nondeductible Expense Benefit Research and Development

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Reconciliation of Statutory Federal Tax Rate [Line Items]

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No definition available.

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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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-Publisher FASB
-Name Accounting Standards Codification
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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 attributable to changes in the valuation allowance for deferred tax assets.

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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 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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