Business Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Operating results for the business segments
Revenues	$ 397,221	$ 379,719	$ 1,209,491	$ 1,121,945
Income (loss) from operations	14,726	2,162	25,207	(4,868)
Telecom Platform Services [Member]
Operating results for the business segments
Revenues	388,939	372,102	1,183,731	1,098,755
Income (loss) from operations	19,314	(125)	38,404	(961)
Consumer Phone Services [Member]
Operating results for the business segments
Revenues	3,427	4,585	11,156	14,949
Income (loss) from operations	341	977	1,377	3,186
All Other [Member]
Operating results for the business segments
Revenues	4,855	3,032	14,604	8,241
Income (loss) from operations	(1,555)	4,330	(3,993)	3,185
Corporate [Member]
Operating results for the business segments
Revenues
Income (loss) from operations	$ (3,374)	$ (3,020)	$ (10,581)	$ (10,278)