Disposition Of A Component Of An Entity (Schedule Of Changes In Earn-Out Receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Business Combinations [Abstract]
Beginning balance	$ 177	$ 314	$ 218	$ 384
Net receipts	(53)	(98)	(102)	(179)
Imputed interest recognized	8	12	16	23
Ending balance	$ 132	$ 228	$ 132	$ 228