Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	6 Months Ended	9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012 Asia-Pacific [Member]	Jan. 31, 2012 Asia-Pacific [Member]	Apr. 30, 2012 Asia-Pacific [Member]	Apr. 30, 2011 Asia-Pacific [Member]
Segment Reporting (Textual) [Abstract]
Impairment charge			$ 115,688			$ 115,688	$ 115,688
Net income reconciliation
Total profit from reportable segments	71,056	77,206	223,981	229,161
Corporate and eliminations	(388)	(3,561)	(6,009)	(12,087)
Unallocated amounts:
Administrative costs	(26,275)	(31,563)	(85,999)	(90,534)
Restructuring charges	(3,440)	(1,211)	(3,440)	(6,986)	(130)			(128)
Impairment charge			(115,688)			(115,688)	(115,688)
Investment and other income (expense)	1,110	1,428	1,720	2,892
Interest expense	(4,735)	(5,103)	(14,715)	(16,640)
Income (loss) before income taxes	37,328	37,196	(150)	105,806
Income taxes	(9,676)	(8,607)	(29,420)	(26,737)
Net income (loss)	$ 27,652	$ 28,589	$ (29,570)	$ 79,069