Summary of Changes in Unrecognized Income Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jul. 31, 2012	Jul. 31, 2011
Income Tax Contingency [Line Items]
Balance as of beginning of fiscal year	$ 16,250	$ 12,124
Increases based on tax positions related to current year	790	1,180
Increases for tax positions of prior years	27	3,455
Decreases for tax positions of prior years	(180)	(37)
Decreases due to settlements with taxing authorities	(9,802)	(111)
Decreases due to lapse of the applicable statute of limitations	(303)	(387)
Adjustment due to foreign exchange rate	(26)	26
Balance as of end of fiscal year	6,756	16,250
Net interest as of end of fiscal year	$ 640	$ 1,485

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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Gross amount of decreases in unrecognized tax benefits resulting from foreign currency translation.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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