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Components of Total Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Schedule of Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits	$ 32,733	$ 33,900	$ 32,174	$ 31,039
Reduction to unrecognized tax benefits for tax credit carry forward	(440)
Accrued interest and penalties	11,671	13,265	12,533
Total unrecognized tax benefits	43,964	47,165	44,707
Short term, included in "Income and other taxes"	2,745	2,649	1,683
Long term	41,219	44,516	43,024
Total unrecognized tax benefits	$ 43,964	$ 47,165	$ 44,707

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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