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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Income Tax [Line Items]      
Tax credit carry forward $ 790 $ 547  
Unrecognized tax benefits that, if recognized, would affect the company's income tax rate 13,679 21,765 22,454
Tax positions related to prior years: Reductions 9,281 113 284
Accrued interest and penalties 5,200 11,671 13,265
Total amount of interest and penalties expense (benefit) recognized (3,418) (932) 503
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions 2,560    
Expected decrease in interest due to resolution of uncertain tax positions 381    
Expected decrease in penalties due to resolution of uncertain tax positions 4    
Minimum
      
Income Tax [Line Items]      
Gross decrease in unrecognized tax benefit 100    
Decrease in interest and penalties 150    
Maximum
      
Income Tax [Line Items]      
Gross decrease in unrecognized tax benefit 3,100    
Decrease in interest and penalties 2,500    
Discontinued Operations
      
Income Tax [Line Items]      
Tax positions related to prior years: Reductions 1,378    
IRS
      
Income Tax [Line Items]      
Tax audit assessments 0    
CALIFORNIA
      
Income Tax [Line Items]      
Tax and interest paid to finalize tax audit for fiscal years 2007 and 2008 1,900    
State and Local Jurisdiction
      
Income Tax [Line Items]      
Tax credit carry forward 1,873    
Gross state tax Net Operating Loss carry forwards 56,000    
Deferred tax asset, Net Operating Loss carry forwards $ 1,301    
State and Local Jurisdiction | Minimum
      
Income Tax [Line Items]      
Tax credit carry forward expiration year 2022    
Gross state tax Net Operating Loss carry forwards, expiration year 2015    
State and Local Jurisdiction | Maximum
      
Income Tax [Line Items]      
Tax credit carry forward expiration year 2024    
Gross state tax Net Operating Loss carry forwards, expiration year 2034