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Income Taxes (Tables)
 12 Months Ended
Jul. 31, 2015
Income Taxes [Abstract]  
Schedule of Income (loss) from Continuing Operations Before Income Taxes
Year ended July 31 
(in thousands)		   2015     2014     2013  
Domestic   $ 7,538     $ 21,624     $ 44,355  
Foreign     84,665       3,368       (10,405 )
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   $ 92,203     $ 24,992     $ 33,950  
Schedule of Deferred Income Tax Assets
July 31 
(in thousands)		   2015     2014  
Deferred income tax assets:            
Bad debt reserve   $ 550     $ 2,188  
Accrued expenses     4,629       2,937  
Stock options and restricted stock     1,030       2,131  
Charitable contributions     1,277       1,230  
Impairment     25,746       25,745  
Depreciation     7,232       7,566  
Unrealized gain     138       163  
Net operating loss     125,223       126,093  
Credits     2,892       3,123  
Total deferred income tax assets     168,717       171,176  
Valuation allowance     (155,393 )     (151,975 )
DEFERRED INCOME TAX ASSETS, NET   $ 13,324     $ 19,201  
Schedule of (Provision for) Benefit from Income Taxes
Year ended July 31 
(in thousands)		   2015     2014     2013  
Current:                  
Federal   $ —     $ (279 )   $ 671  
State and local     —       —       148  
Foreign     (311 )     (1,177 )     (1,431 )
      (311 )     (1,456 )     (612 )
Deferred:                        
Federal     (1,967 )     (6,461 )     (14,181 )
State and local     (245 )     (175 )     (1,079 )
Foreign     (3,565 )     4,110       —  
      (5,777 )     (2,526 )     (15,260 )
PROVISION FOR INCOME TAXES   $ (6,088 )   $ (3,982 )   $ (15,872 )
Schedule of Statutory Income Tax Rate and Income Taxes Provided
Year ended July 31 
(in thousands)		   2015     2014     2013  
U.S. federal income tax at statutory rate   $ (32,271 )   $ (8,747 )   $ (11,883 )
Valuation allowance     —       4,110       —  
Foreign tax rate differential     25,757       961       (5,073 )
Nondeductible expenses     659       761       714  
Other     (73 )     7       50  
Prior year tax (expense) benefit     —       (960 )     921  
State and local income tax, net of federal benefit     (160 )     (114 )     (601 )
PROVISION FOR INCOME TAXES   $ (6,088 )   $ (3,982 )   $ (15,872 )
Schedule of Change in Valuation Allowance
Year ended July 31 
(in thousands)		   Balance at
beginning of
year		     Additions
charged to
costs and
expenses		     Deductions     Balance at
end of year		  
2015                        
Reserves deducted from deferred income taxes, net:                        
Valuation allowance   $ 151,975     $ 3,418     $ —     $ 155,393  
2014                                
Reserves deducted from deferred income taxes, net:                                
Valuation allowance   $ 167,328     $ —     $ (15,353 )   $ 151,975  
2013                                
Reserves deducted from deferred income taxes, net:                                
Valuation allowance   $ 204,977     $ 462     $ (38,111 )   $ 167,328  
Summary of Change in Balance of Unrecognized Income Tax Benefits
Year ended July 31 
(in thousands)		   2015     2014     2013  
Balance at beginning of year   $ —     $ 356     $ —  
Additions based on tax positions related to the current year     —       —       —  
Additions for tax positions of prior years     —       —       356  
Reductions for tax positions of prior years     —       —       —  
Settlements     —       (356 )     —  
Lapses of statutes of limitations     —       —       —  
Balance at end of year   $ —     $ —     $ 356