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Quarterly Information (unaudited) (Details Textual) (USD $)	3 Months Ended											12 Months Ended		3 Months Ended
	Feb. 28, 2013	Nov. 30, 2012	May 31, 2014 Navilyst [Member]	Feb. 28, 2014 Navilyst [Member]	Nov. 30, 2013 Navilyst [Member]	Aug. 31, 2013 Navilyst [Member]	May 31, 2013 Navilyst [Member]	Feb. 28, 2013 Navilyst [Member]	Nov. 30, 2012 Navilyst [Member]	Aug. 31, 2012 Navilyst [Member]	Nov. 30, 2012 Vortex Medical [Member]	May 31, 2014 Vortex Medical [Member]	May 31, 2013 Vortex Medical [Member]	Aug. 31, 2013 Clinical Devices, B.V. [Member]	Feb. 28, 2013 Vortex and Microsulis Medical Ltd [Member]	Nov. 30, 2012 Vortex Medical [Member]
Quarterly Information (Textual) [Abstract]
Acquisition of related cost\transaction and related costs			$ 1,300,000	$ 1,400,000	$ 1,600,000	$ 1,200,000	$ 2,100,000	$ 1,300,000	$ 1,700,000	$ 2,200,000		$ 162,000	$ 645,000	$ 300,000	$ 414,000	$ 325,000
Consolidation charges			400,000	1,000,000
Litigation related costs			1,100,000		800,000		580,000				425,000				901,000
Quarterly Information (Additional Textual) [Abstract]
Costs related to the discontinuance of product line								1,600,000
Transaction and related costs, UK facility	920,000	476,000					717,000			337,000
Gain (loss) on sale of product line											$ 770,000

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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