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Goodwill (Details)
 3 Months Ended 6 Months Ended
Jan. 31, 2016
operating_segment
Jan. 31, 2017
USD ($)
operating_segment
Jan. 31, 2017
USD ($)
operating_segment
Aug. 01, 2016
$ / shares
Goodwill [Line Items]        
Balance as of July 31, 2016     $ 287,618,000  
Changes resulting from TCS acquisition     3,015,000  
Balance as of January 31, 2017   $ 290,633,000 $ 290,633,000  
Number of reportable segments | operating_segment 3 2 2  
Commercial Solutions Segment        
Goodwill [Line Items]        
Balance as of July 31, 2016     $ 229,273,000  
Changes resulting from TCS acquisition     2,167,000  
Balance as of January 31, 2017   $ 231,440,000 231,440,000  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount       11.80%
Government Solutions Segment        
Goodwill [Line Items]        
Balance as of July 31, 2016     58,345,000  
Changes resulting from TCS acquisition     848,000  
Balance as of January 31, 2017   $ 59,193,000 $ 59,193,000  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount       40.50%
Common Stock [Member]        
Goodwill [Line Items]        
Common stock price (in dollars per share) | $ / shares       $ 13.43