Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 31, 2013 Segment	Jul. 31, 2012	Jul. 31, 2011
Accounting Policies [Line Items]
Number of reportable segments	3
Investments accounted for using the equity method	$ 8,100,000	$ 6,100,000
Investments accounted for using the cost method	1,500,000	1,100,000
Restricted cash and cash equivalents	20,943,000	5,733,000	5,011,000
Advertising expense	13,100,000	17,000,000	13,700,000
USF charges	800,000	1,100,000	1,500,000
Percentage of consolidated revenues not exceeded by one single customer	10.00%	10.00%	10.00%
Percentage of consolidated revenues from continuing operations	10.00%	8.10%	7.10%
Percentage of gross trade accounts receivable from customers	16.60%	24.30%
Customer Lists [Member]
Accounting Policies [Line Items]
Amortization period	15
Trademarks [Member]
Accounting Policies [Line Items]
Amortization period	5
Non Compete Agreement [Member]
Accounting Policies [Line Items]
Amortization period	3
Maximum [Member]
Accounting Policies [Line Items]
Amortization expense related to capitalized software	6,300,000	5,800,000	4,700,000
Unamortized capitalized internal use software costs	$ 10,200,000	$ 8,300,000
Equipment [Member]
Accounting Policies [Line Items]
Estimated useful lives of Long-Lived assets	5
Estimated useful lives of Long-Lived assets	7
Estimated useful lives of Long-Lived assets	20
Building [Member]
Accounting Policies [Line Items]
Estimated useful lives of Long-Lived assets	40
Computer Software [Member]
Accounting Policies [Line Items]
Estimated useful lives of Long-Lived assets	2
Estimated useful lives of Long-Lived assets	3
Estimated useful lives of Long-Lived assets	5
Furniture and Fixtures [Member]
Accounting Policies [Line Items]
Estimated useful lives of Long-Lived assets	5
Estimated useful lives of Long-Lived assets	7
Estimated useful lives of Long-Lived assets	10
Internal-use Software [Member]
Accounting Policies [Line Items]
Estimated useful lives of Long-Lived assets	Excess of one year