A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

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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Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Jul. 31, 2012	Apr. 30, 2012 Reversal and Re-Measurement of Tax Reserves	Jul. 31, 2013 Subsequent Event Minimum	Jul. 31, 2013 Subsequent Event Maximum
Income Taxes [Line Items]
Effective tax rate	24.00%	29.00%	28.00%	(15.00%)			29.00%	30.00%
Statutory income tax rate	35.00%	35.00%	35.00%
Discrete benefit				$ (10,025)
Income Tax expense benefit	1,678	2,966	7,418	(4,034)		2,308
Income tax refund received		12,007
Professional fees related to refunds of Tax				2,714
Unrecognized tax benefit	1,072		1,072
Unrecognized tax benefits, accrued interest and penalties	$ 664		$ 664		$ 640