Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Liabilities, Fair Value Disclosure	$ 10,500	$ 9,100
Change in Fair Value of Contingent Consideration	1,400
Level 3 [Member]
Liabilities, Fair Value Disclosure	10,500	9,100
Canyons [Member]
Liabilities, Fair Value Disclosure	10,500
Money Market Funds [Member]
Cash and Cash Equivalents, Fair Value Disclosure	9,022	34,029
Money Market Funds [Member] | Level 1 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	9,022	34,029
Commercial Paper [Member]
Cash and Cash Equivalents, Fair Value Disclosure	630	630
Commercial Paper [Member] | Level 2 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	630	630
Certificates of Deposit [Member]
Cash and Cash Equivalents, Fair Value Disclosure	880	630
Certificates of Deposit [Member] | Level 2 [Member]
Cash and Cash Equivalents, Fair Value Disclosure	$ 880	$ 630