Reconciliation of Income Taxes at United States Rate to Effective Tax Rate (Detail)	12 Months Ended
Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Reconciliation of Statutory Federal Tax Rate [Line Items]
U.S. Federal statutory tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	(3.00%)	(1.00%)	(1.00%)
Domestic production benefit	(2.00%)	(2.00%)	(2.00%)
General business credit (U.S. R&D)	(3.00%)	(4.00%)	(1.00%)
Valuation allowance		1.00%	1.00%
Change in classification of Canadian entity	(40.00%)
Effect of international operations	(9.00%)	(2.00%)	(3.00%)
(Decrease) increase in tax reserves	(2.00%)	1.00%	(26.00%)
Other items, net	5.00%	1.00%
Effective tax rate	(19.00%)	29.00%	3.00%

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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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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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