Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Intersegment information
Revenues from external customers	$ 349,508	$ 329,588
Segment profit	79,570	76,813
Americas [Member]
Intersegment information
Revenues from external customers	153,863	145,988
Intersegment revenues	10,225	9,748
Segment profit	43,230	39,359
Europe [Member]
Intersegment information
Revenues from external customers	97,356	92,050
Intersegment revenues	762	893
Segment profit	26,299	24,061
Asia-Pacific [Member]
Intersegment information
Revenues from external customers	98,289	91,550
Intersegment revenues	7,442	5,946
Segment profit	13,304	16,829
Total Region [Member]
Intersegment information
Revenues from external customers	349,508	329,588
Intersegment revenues	18,429	16,587
Segment profit	82,833	80,249
Corporate and Eliminations [Member]
Intersegment information
Intersegment revenues	(18,429)	(16,587)
Segment profit	$ (3,263)	$ (3,436)