Components of Other Gains (Losses), Net (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Component Of Other Expense Income Nonoperating [Line Items]
Foreign currency exchange gain (losses)	$ 137	$ (84)	$ (616)	$ 2,346
Gains (losses) on disposal of assets	1	15	973	44
Gains (losses) on Trading Securities	1,860	3,227	(6,488)	5,328
Other, net	241	365	262	(957)
Other gains (losses), net	$ 2,239	$ 3,523	$ (5,869)	$ 6,761

Component Of Other Expense Income Nonoperating [Line Items]

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- Definition

Other Nonoperating Gain Loss

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

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-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The change in other comprehensive income during the reporting period, net of tax, for an item that is not separately disclosed.

+ References

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- Definition

Amount of gain (loss) realized from securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6526789

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