Note 8 - Other Intangible Assets, Net (Details) - Intangible Assets - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2015	May. 31, 2015
Other intangible assets subject to amortization:
Intangible assets subject to amortization, cost	$ 819,272	$ 819,012
Intangible assets subject to amortization, accumulated amortization	(210,026)	(196,418)
Intangible assets subject to amortization, net	609,246	622,594
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, cost	27,700	27,700
Intangible assets not subject to amortization, net	27,700	27,700
Other intangible assets, net	846,972	846,712
Other intangible assets, net	(210,026)	(196,418)
Other intangible assets, net	636,946	650,294
In Process Research and Development [Member]
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, cost	27,700	27,700
Intangible assets not subject to amortization, net	$ 27,700	27,700
Customer Relationships [Member]
Other intangible assets subject to amortization:
Intangible assets subject to amortization, weighted average life	19 years
Intangible assets subject to amortization, cost	$ 462,639	462,534
Intangible assets subject to amortization, accumulated amortization	(91,868)	(86,052)
Intangible assets subject to amortization, net	$ 370,771	376,482
Technology-Based Intangible Assets [Member]
Other intangible assets subject to amortization:
Intangible assets subject to amortization, weighted average life	11 years
Intangible assets subject to amortization, cost	$ 315,004	314,850
Intangible assets subject to amortization, accumulated amortization	(106,645)	(99,565)
Intangible assets subject to amortization, net	$ 208,359	215,285
Trade Names [Member]
Other intangible assets subject to amortization:
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	(10,754)	(10,088)
Intangible assets subject to amortization, net	$ 29,246	29,912
Off-Market Favorable Lease [Member]
Other intangible assets subject to amortization:
Intangible assets subject to amortization, weighted average life	7 years
Intangible assets subject to amortization, cost	$ 1,200	1,200
Intangible assets subject to amortization, accumulated amortization	(576)	(557)
Intangible assets subject to amortization, net	$ 624	643
Other Intangible Assets [Member]
Other intangible assets subject to amortization:
Intangible assets subject to amortization, weighted average life	4 years
Intangible assets subject to amortization, cost	$ 429	428
Intangible assets subject to amortization, accumulated amortization	(183)	(156)
Intangible assets subject to amortization, net	$ 246	$ 272