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Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 29, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 405,796 | $ 383,930 | [1] | $ 394,173 | $ 412,878 | [2] | $ 420,687 | $ 403,761 | $ 406,423 | $ 420,670 | $ 1,596,777 | $ 1,651,541 | $ 1,620,617
Income (loss) from operations | 7,238 | 2,470 | [1] | $ 3,735 | 79,607 | [2] | $ 5,813 | $ 9,170 | $ 7,574 | $ 7,283 | 93,050 | 29,840 | 29,391
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 18,418 | 16,318 | $ 14,910
Severance | $ 200 | 6,200 |  |  |  |  |  |  |  |  | 8,363 |  |
Gain on sale of interest in Fabrix Systems Ltd. |  | $ 1,200 |  |  | $ 75,100 |  |  |  |  |  | 76,864 |  |
Other operating gains (losses), net |  |  |  |  |  |  |  |  |  |  | $ (1,552) | 835 | $ 9,251
Impairment of building and improvements |  |  |  |  |  |  |  |  |  |  |  |  | 4,359
Telecom Platform Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Severance |  |  |  |  |  |  |  |  |  |  | $ 1,900 |  |
Operating Segments [Member] | Telecom Platform Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 1,572,744 | 1,615,570 | 1,588,071
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | 26,951 | 45,062 | 48,661
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 16,169 | 13,776 | 12,342
Severance |  |  |  |  |  |  |  |  |  |  | $ 7,696 |  |
Other operating gains (losses), net |  |  |  |  |  |  |  |  |  |  |  | 650 | $ 9,251
Impairment of building and improvements |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Consumer Phone Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 8,629 | 11,023 | $ 14,514
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | $ 1,259 | $ 1,797 | 1,824
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ 1
Severance |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating gains (losses), net |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of building and improvements |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | All Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 15,404 | $ 24,948 | $ 18,032
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | 77,969 | (1,735) | (7,093)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 2,243 | 2,512 | 2,471
Severance |  |  |  |  |  |  |  |  |  |  | 35 |  |
Gain on sale of interest in Fabrix Systems Ltd. |  |  |  |  |  |  |  |  |  |  | $ 76,864 |  |
Other operating gains (losses), net |  |  |  |  |  |  |  |  |  |  |  | $ 638 |
Impairment of building and improvements |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,359
Operating Segments [Member] | Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | $ (13,129) | $ (15,284) | $ (14,001)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 6 | 30 | $ 96
Severance |  |  |  |  |  |  |  |  |  |  | 632 |  |
Other operating gains (losses), net |  |  |  |  |  |  |  |  |  |  | $ (1,552) | $ (453) |
Impairment of building and improvements |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Included in income from operations was severance expense of $6.2 million, gain on sale of interest in Fabrix Systems Ltd. of $1.2 million and other operating losses of $1.6 million.
[2] | Included in income from operations was gain on sale of interest in Fabrix Systems Ltd. of $75.1 million.

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