Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Jul. 31, 2016		Apr. 30, 2016		Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015		Jan. 31, 2015	Oct. 31, 2014	[4]	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 368,075	[1]	$ 355,154	[2]	$ 382,454	$ 390,578	$ 405,796	$ 383,930	[3]	$ 394,173	$ 412,878		$ 1,496,261	$ 1,596,777	$ 1,651,541
Income (loss) from operations	6,225	[1]	5,676	[2]	$ 6,377	7,925	7,238	2,470	[3]	$ 3,735	$ 79,607		26,203	93,050	29,840
Depreciation and amortization													20,535	18,418	16,318
Severance	$ 6,300						$ 200	6,200					6,510	8,363
Gain on sale of member interest in Visa Europe Ltd.													7,476
Gain on sale of interest in Fabrix Systems Ltd.			$ 1,100			$ 75,100		1,200					1,086	76,864
Other operating gains (losses), net								$ 1,600					(326)	(1,552)	835
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													1,477,906	1,572,744	1,615,570
Income (loss) from operations													31,214	26,951	45,062
Depreciation and amortization													18,547	16,169	13,776
Severance													6,200	7,696
Gain on sale of member interest in Visa Europe Ltd.													7,476
Gain on sale of interest in Fabrix Systems Ltd.
Other operating gains (losses), net													(326)		650
Operating Segments [Member] | Consumer Phone Services [Member]
Segment Reporting Information [Line Items]
Revenues													6,874	8,629	11,023
Income (loss) from operations													1,218	1,259	1,797
Depreciation and amortization
Severance
Gain on sale of member interest in Visa Europe Ltd.
Gain on sale of interest in Fabrix Systems Ltd.
Other operating gains (losses), net
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Revenues													11,481	15,404	24,948
Income (loss) from operations													4,165	77,969	(1,735)
Depreciation and amortization													1,987	2,243	2,512
Severance														35
Gain on sale of member interest in Visa Europe Ltd.
Gain on sale of interest in Fabrix Systems Ltd.													1,086	76,864
Other operating gains (losses), net															638
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) from operations													(10,394)	(13,129)	(15,284)
Depreciation and amortization													1	6	30
Severance													310	632
Gain on sale of member interest in Visa Europe Ltd.
Gain on sale of interest in Fabrix Systems Ltd.
Other operating gains (losses), net														$ (1,552)	$ (453)

[1] Included in income from operations was severance expense of $6.3 million and gain on sale of member interest in Visa Europe Ltd. of $7.5 million.

[2] Included in income from operations was gain on sale of interest in Fabrix Systems Ltd. of $1.1 million.

[3] 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.

[4] Included in income from operations was gain on sale of interest in Fabrix Systems Ltd. of $75.1 million.