Components of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified																																		12 Months Ended
	Jul. 31, 2012	Jan. 31, 2012		Oct. 31, 2011		Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2011		Oct. 31, 2010		Jul. 31, 2010		Apr. 30, 2010		Jan. 31, 2010		Oct. 31, 2009		Jul. 31, 2012 Client Relationships [Member]	Jul. 31, 2011 Client Relationships [Member]	Jul. 31, 2010 Client Relationships [Member]	Jul. 31, 2012 Developed Technology [Member]	Jul. 31, 2011 Developed Technology [Member]	Jul. 31, 2010 Developed Technology [Member]	Jul. 31, 2012 Trade Names [Member]	Jul. 31, 2011 Trade Names [Member]	Jul. 31, 2010 Trade Names [Member]	Jul. 31, 2012 Non-Competes [Member]	Jul. 31, 2011 Non-Competes [Member]	Jul. 31, 2010 Non-Competes [Member]	Jul. 31, 2010 Minimum [Member] Client Relationships [Member]	Jul. 31, 2012 Minimum [Member] Developed Technology [Member]	Jul. 31, 2011 Minimum [Member] Developed Technology [Member]	Jul. 31, 2010 Minimum [Member] Developed Technology [Member]	Jul. 31, 2012 Minimum [Member] Trade Names [Member]	Jul. 31, 2011 Minimum [Member] Trade Names [Member]	Jul. 31, 2010 Minimum [Member] Trade Names [Member]	Jul. 31, 2012 Minimum [Member] Non-Competes [Member]	Jul. 31, 2011 Minimum [Member] Non-Competes [Member]	Jul. 31, 2010 Minimum [Member] Non-Competes [Member]	Jul. 31, 2012 Maximum [Member] Client Relationships [Member]	Jul. 31, 2011 Maximum [Member] Client Relationships [Member]	Jul. 31, 2010 Maximum [Member] Client Relationships [Member]	Jul. 31, 2012 Maximum [Member] Developed Technology [Member]	Jul. 31, 2011 Maximum [Member] Developed Technology [Member]	Jul. 31, 2010 Maximum [Member] Developed Technology [Member]	Jul. 31, 2012 Maximum [Member] Trade Names [Member]	Jul. 31, 2011 Maximum [Member] Trade Names [Member]	Jul. 31, 2010 Maximum [Member] Trade Names [Member]	Jul. 31, 2012 Maximum [Member] Non-Competes [Member]	Jul. 31, 2011 Maximum [Member] Non-Competes [Member]	Jul. 31, 2010 Maximum [Member] Non-Competes [Member]
Goodwill And Intangible Assets [Line Items]
Gross Carrying Amount	$ 54,610					$ 54,610																$ 34,500	$ 34,500	$ 34,500	$ 13,992	$ 13,992	$ 13,992	$ 5,405	$ 5,405	$ 5,405	$ 713	$ 713	$ 713
Accumulated amortization/ impairment	51,713					49,911								30,437								32,847	32,215	21,503	12,990	12,211	5,638	5,174	4,801	2,800	702	684	496
Net Book Value	$ 2,897	$ 4,029	[1]	$ 4,360	[1]	$ 4,699	[1]	$ 5,736	[1]	$ 6,798	[1]	$ 22,495	[1]	$ 24,173	[1]	$ 25,852	[1]	$ 27,509	[1]	$ 21,748	[1]	$ 1,653	$ 2,285	$ 12,997	$ 1,002	$ 1,781	$ 8,354	$ 231	$ 604	$ 2,605	$ 11	$ 29	$ 217
Weighted average amortization period																																		7 years	3 years	3 years	3 years	3 years	3 years	3 years	1 year	1 year	1 year	7 years	7 years	10 years	7 years	7 years	8 years	7 years	7 years	8 years	5 years	5 years	5 years

[1] As Restated