Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended														12 Months Ended
	Jul. 31, 2017	[1]	Apr. 29, 2017	[2]	Jan. 31, 2017	Oct. 31, 2016	[3]	Jul. 31, 2016		Apr. 30, 2016		Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 394,987		$ 370,035		$ 367,556	$ 369,151		$ 368,075	[4]	$ 355,154	[5]	$ 382,454	$ 390,578		$ 1,501,729	$ 1,496,261	$ 1,596,777
Income (loss) from operations	$ 3,737		$ (6,502)		$ 3,128	$ 5,186		6,225	[4]	5,676	[5]	$ 6,377	$ 7,925		5,549	26,203	93,050
Depreciation and amortization															21,704	20,535	18,418
Severance								6,300						$ 200		6,510	8,363
Gain on sale of member interest in Visa Europe Ltd.								$ 7,500							(63)	7,476
Gain on sale of interest in Fabrix Systems, Ltd.										$ 1,100						1,086	76,864
Adjustment to gain on sale of member interest in Visa Europe Ltd.															(63)
Other (see Note 12)															(10,412)	(326)	(1,552)
UCaaS [Member]
Segment Reporting Information [Line Items]
Revenues															29,450	26,353	29,434
Consumer Phone Services [Member]
Segment Reporting Information [Line Items]
Revenues															5,482	6,874	8,629
Operating Segments [Member] | Telecom Platform Services [Member]
Segment Reporting Information [Line Items]
Revenues															1,464,059	1,451,553	1,543,310
Income (loss) from operations															24,427	32,813	26,418
Depreciation and amortization															16,134	15,787	13,764
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.
Adjustment to gain on sale of member interest in Visa Europe Ltd.															(63)
Other (see Note 12)																(326)
Operating Segments [Member] | UCaaS [Member]
Segment Reporting Information [Line Items]
Revenues															29,450	26,353	29,434
Income (loss) from operations															(1,865)	(1,599)	533
Depreciation and amortization															3,875	2,760	2,405
Severance
Gain on sale of member interest in Visa Europe Ltd.
Gain on sale of interest in Fabrix Systems, Ltd.
Adjustment to gain on sale of member interest in Visa Europe Ltd.
Other (see Note 12)
Operating Segments [Member] | Consumer Phone Services [Member]
Segment Reporting Information [Line Items]
Revenues															5,482	6,874	8,629
Income (loss) from operations															1,069	1,218	1,259
Depreciation and amortization
Severance
Gain on sale of member interest in Visa Europe Ltd.
Gain on sale of interest in Fabrix Systems, Ltd.
Adjustment to gain on sale of member interest in Visa Europe Ltd.
Other (see Note 12)
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Revenues															2,738	11,481	15,404
Income (loss) from operations															342	4,165	77,969
Depreciation and amortization															1,695	1,987	2,243
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
Adjustment to gain on sale of member interest in Visa Europe Ltd.
Other (see Note 12)
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) from operations															(18,424)	(10,394)	(13,129)
Depreciation and amortization																1	6
Severance																310	632
Gain on sale of member interest in Visa Europe Ltd.
Gain on sale of interest in Fabrix Systems, Ltd.
Adjustment to gain on sale of member interest in Visa Europe Ltd.
Other (see Note 12)															$ (10,412)		$ (1,552)

[1] Included in net loss was income tax expense of $11.1 million from an increase in the valuation allowance on deferred tax assets.

[2] Included in loss from operations was expense of $10.1 million related to a legal settlement and mutual release, including legal fees incurred in the quarter.

[3] Included in net income was a benefit from income taxes of $16.6 million from the full recognition of certain deferred tax assets.

[4] 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.

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