Segment Information - Schedule of Segment Reporting Information By Segment (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
Segment Reporting Information [Line Items]
Revenues from external customers	$ 324,182	$ 320,584	$ 661,828	$ 670,092
Intersegment revenues	0	0	0	0
Segment profit	59,779	67,734	138,061	147,304
Americas [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	147,716	138,405	296,408	292,267
Intersegment revenues	8,339	9,992	18,420	20,216
Segment profit	32,336	35,798	76,969	79,028
EMEA [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	94,395	95,593	187,628	192,949
Intersegment revenues	778	1,270	1,701	2,032
Segment profit	23,723	26,562	47,290	52,861
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	82,071	86,586	177,792	184,876
Intersegment revenues	6,099	7,321	12,506	14,763
Segment profit	5,514	7,733	17,569	21,037
Total Region [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	324,182	320,584	661,828	670,092
Intersegment revenues	15,216	18,583	32,627	37,011
Segment profit	61,573	70,093	141,828	152,926
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	0	0	0	0
Intersegment revenues	(15,216)	(18,583)	(32,627)	(37,011)
Segment profit	$ (1,794)	$ (2,359)	$ (3,767)	$ (5,622)