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Business Segment Information (Tables)
 12 Months Ended
Jul. 31, 2015
Business Segment Information [Abstract]  
Summary of operating results of business segments

(in thousands)		 Telecom
Platform
Services		  Consumer
Phone
Services		  All Other  Corporate  Total 
Year ended July 31, 2015                    
Revenues $1,572,744  $8,629  $15,404  $—  $1,596,777 
Income (loss) from operations  26,951   1,259   77,969   (13,129)  93,050 
Depreciation and amortization  16,169   —   2,243   6   18,418 
Severance  7,696   —   35   632   8,363 
Gain on sale of interest in Fabrix Systems Ltd.  —   —   76,864   —   76,864 
Other operating loss  —   —   —   (1,552)  (1,552)
Year ended July 31, 2014                    
Revenues $1,615,570  $11,023  $24,948  $—  $1,651,541 
Income (loss) from operations  45,062   1,797   (1,735)  (15,284)  29,840 
Depreciation and amortization  13,776   —   2,512   30   16,318 
Other operating gains (losses), net  650   —   638   (453)  835 
Year ended July 31, 2013                    
Revenues $1,588,071  $14,514  $18,032  $—  $1,620,617 
Income (loss) from operations  48,661   1,824   (7,093)  (14,001)  29,391 
Depreciation and amortization  12,342   1   2,471   96   14,910 
Impairment of building and improvements  —   —   4,359   —   4,359 
Other operating gains  9,251   —   —   —   9,251
Schedule of revenue from external customers by geographic areas
Year ended July 31 2015  2014  2013 
Revenue from customers located outside of the United States  30%  30%  23%
Revenue from customers located in the United Kingdom  20%  19%  13%
Schedule of long-lived assets and total assets by geographic areas
(in thousands) United
States		  Foreign
Countries		  Total 
July 31, 2015         
Long-lived assets, net $89,340  $1,976  $91,316 
Total assets  281,625   204,057   485,682 
July 31, 2014            
Long-lived assets, net $79,281  $2,479  $81,760 
Total assets  284,249   196,682   480,931 
July 31, 2013            
Long-lived assets, net $77,580  $3,162  $80,742 
Total assets  294,337   141,070   435,407