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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

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