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Consolidated Financial Statements (Details) (USD $)	1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 24, 2012 Observations	Feb. 13, 2012 Observations	Feb. 10, 2012 Observations	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012 Segment	Nov. 30, 2011	May 31, 2012 Reporint_Unit	May 22, 2012
Consolidated Financial Statements (Textual) [Abstract]
Upfront payment				$ 15,105,000,000		$ 15,105,000,000
Goodwill									145,221,000
Number of reportable segments						1		2
Number of observations	5	6	12
Costs for quality call to action program						3,100,000
Number of business days to provide response to FDA						15 days
LC Bead sales					9,100,000		17,100,000
Transaction and Severance costs related to Acquisition				1,700,000		3,900,000
Estimated cost of project						3,400,000
Costs incurred associated with closure of facility				279,000	587,000	616,000	883,000
Core Technologies [Member]
Consolidated Financial Statements (Textual) [Abstract]
Amortized estimated useful lives						15 years
Vortex Medical [Member]
Consolidated Financial Statements (Textual) [Abstract]
Total estimated purchase consideration				75,407,000		75,407,000
Upfront payment				15,105,000		15,105,000
Contingent consideration				60,302,000		60,302,000
Goodwill				30,019,000		30,019,000
Acquisition related costs						$ 325,000

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