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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2014 Vortex Medical [Member]	Oct. 15, 2012 Vortex Medical [Member]	May 31, 2014 Microsulis Medical Ltd [Member]	Feb. 01, 2013 Microsulis Medical Ltd [Member]	May 31, 2014 Navilyst [Member]	May 22, 2012 Navilyst [Member]	May 31, 2014 Clinical Devices, B.V. [Member]	Aug. 15, 2013 Clinical Devices, B.V. [Member]
Adjustments to Goodwill
Goodwill, Beginning Balance		$ 355,458	$ 308,912		$ 29,519		$ 19,284		$ 144,705		$ 4,800
Goodwill recognized from business combination and asset acquisition				29,519		19,284				4,836
Adjustments to Navilyst purchase price allocation	500							(2,257)
Goodwill, Ending Balance	$ 360,294	$ 355,458	$ 308,912	$ 29,519	$ 29,519	$ 19,284	$ 19,284		$ 144,705		$ 4,800

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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