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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Income Tax [Line Items]
Capital loss carry forward expected to be realized prior to expiration	$ 69
Capital loss carry forward expiration year	2014
Tax credit carry forward	547
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate	21,765	22,454	21,453
Total amount of liabilities accrued for interest and penalties related to unrecognized tax benefits	11,671	13,265	12,533
Total amount of interest and penalties expense (benefit) recognized	(932)	503	(995)
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions	(4,000)
Expected decrease in interest due to resolution of uncertain tax positions	(1,000)
Expected decrease in penalties due to resolution of uncertain tax positions	(60)
Minimum
Income Tax [Line Items]
Gross decrease in unrecognized tax benefit	(2,600)
Decrease in interest and penalties	(1,300)
Maximum
Income Tax [Line Items]
Gross decrease in unrecognized tax benefit	(9,700)
Decrease in interest and penalties	(3,800)
State and Local Jurisdiction
Income Tax [Line Items]
Tax credit carry forward	1,282
Gross state tax Net Operating Loss carry forwards	66,000
Deferred tax asset, Net Operating Loss carry forwards	1,375
State and Local Jurisdiction \| Minimum
Income Tax [Line Items]
Capital loss carry forward expiration year	2022
Gross state tax Net Operating Loss carry forwards, expiration year	2014
State and Local Jurisdiction \| Maximum
Income Tax [Line Items]
Capital loss carry forward expiration year	2023
Gross state tax Net Operating Loss carry forwards, expiration year	2033
Idaho
Income Tax [Line Items]
Tax and interest paid to finalize tax audit for tax years ended July 31, 2009 through 2011	$ 70