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Components of Total Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 33,900	$ 32,174	$ 31,039	$ 30,235
Accrued interest and penalties	13,265	12,533	13,326
Total unrecognized tax benefits	47,165	44,707	44,365
Short-term, included in "Income and other taxes"	2,649	1,683	8,679
Long-term	44,516	43,024	35,686
Total unrecognized tax benefits	$ 47,165	$ 44,707	$ 44,365

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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