Goodwill and Intangible Assets (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Jul. 31, 2011
Goodwill and Intangible Assets (Textuals) [Abstract]
Decrease in goodwill due to negative effects of foreign currency translation	$ 8,040
Accumulated impairment losses	0		0
Amortization of Intangible Assets	4,080	5,147
Projected Future amortization expense, year one	16,436
Projected Future amortization expense, year two	10,578
Projected Future amortization expense, year three	5,617
Projected Future amortization expense, year four	5,263
Projected Future amortization expense, year five	$ 4,163