Note 7 - Intangible Assets (Details) - Intangible Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	May 31, 2013
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets subject to amortization - cost	$ 798,996	$ 798,458
Intangible assets subject to amortization - accumulated amortization	(103,279)	(90,005)
Intangible assets subject to amortization - net	695,717	708,453
Intangible assets, net	805,146	804,608
Intangible assets, net	(103,279)	(90,005)
Intangible assets, net	701,867	714,603
In Process Research and Development [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets not subject to amortization - cost	6,150	6,150
Intangible assets not subject to amortization - net	6,150	6,150
Non-amortizable assets [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets not subject to amortization - cost	6,150	6,150
Intangible assets not subject to amortization - net	6,150	6,150
Customer Lists [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets subject to amortization - weighted average life	20 years
Intangible assets subject to amortization - cost	466,347	465,909
Intangible assets subject to amortization - accumulated amortization	(46,306)	(40,392)
Intangible assets subject to amortization - net	420,041	425,517
Intangible assets, net	(46,306)	(40,392)
Existing technology and trade names [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets subject to amortization - weighted average life	11 years
Intangible assets subject to amortization - cost	291,250	291,250
Intangible assets subject to amortization - accumulated amortization	(51,165)	(44,526)
Intangible assets subject to amortization - net	240,085	246,724
Intangible assets, net	(51,165)	(44,526)
Corporate trade name [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets subject to amortization - weighted average life	15 years
Intangible assets subject to amortization - cost	40,000	40,000
Intangible assets subject to amortization - accumulated amortization	(5,421)	(4,754)
Intangible assets subject to amortization - net	34,579	35,246
Intangible assets, net	(5,421)	(4,754)
Below market leasehold interests [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets subject to amortization - weighted average life	8 years
Intangible assets subject to amortization - cost	1,200	1,200
Intangible assets subject to amortization - accumulated amortization	(362)	(313)
Intangible assets subject to amortization - net	838	887
Intangible assets, net	(362)	(313)
Deferred licensing costs [Member]
Note 7 - Intangible Assets (Details) - Intangible Assets [Line Items]
Intangible assets subject to amortization - weighted average life	6 years
Intangible assets subject to amortization - cost	199	99
Intangible assets subject to amortization - accumulated amortization	(25)	(20)
Intangible assets subject to amortization - net	174	79
Intangible assets, net	$ (25)	$ (20)