Business Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Operating results for the business segments
Revenues	$ 411,685	$ 365,449	$ 812,270	$ 742,226
Income (loss) from operations	5,252	4,032	10,480	(7,030)
Telecom Platform Services [Member]
Operating results for the business segments
Revenues	402,758	357,588	794,791	726,653
Income (loss) from operations	10,050	6,513	19,090	(836)
Consumer Phone Services [Member]
Operating results for the business segments
Revenues	3,714	4,973	7,729	10,365
Income (loss) from operations	437	998	1,036	2,208
All Other [Member]
Operating results for the business segments
Revenues	5,213	2,888	9,750	5,208
Income (loss) from operations	(807)	(260)	(2,439)	(1,144)
Corporate [Member]
Operating results for the business segments
Revenues
Income (loss) from operations	$ (4,428)	$ (3,219)	$ (7,207)	$ (7,258)