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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.