OEM Partner Agreements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013 Partner	Oct. 31, 2012
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of U.S. based national and international marketing partners	2
Net Sales	$ 15,530	$ 14,620
Reporting threshold (in hundredths)	10.00%
Codman collaborative arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Numbers of years a product was sold	30 years
Net Sales	4,101	2,816
Percent of net sales (in hundredths)	26.40%	19.30%
Codman collaborative arrangement [Member] | Bipolar generators and related disposables and accessories [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement time frame	3 years
Collaborative arrangements extension	3 years
Codman collaborative arrangement [Member] | Malis Spetzler Trademark [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement time frame	3 years
Collaborative arrangements extension	3 years
Stryker collaborative arrangement [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Net Sales	$ 2,162	$ 2,559
Percent of net sales (in hundredths)	13.90%	17.50%