Note 15 - Segment and Geographic Information (Details) - Long-Lived Assets by Geographic Area (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014		May 31, 2013
Long-lived tangible assets by geography:
Long-lived assets (excluding goodwill and intangibles)	$ 75,962		$ 76,381
Concentration of net assets by geography:
Concentration of net assets	635,256		644,706
UNITED STATES
Long-lived tangible assets by geography:
Long-lived assets (excluding goodwill and intangibles)	54,646		57,184
Concentration of net assets by geography:
Concentration of net assets	467,084		485,968
Europe [Member]
Long-lived tangible assets by geography:
Long-lived assets (excluding goodwill and intangibles)	15,155	[1]	13,399	[1]
Concentration of net assets by geography:
Concentration of net assets	123,987		114,740
CANADA
Long-lived tangible assets by geography:
Long-lived assets (excluding goodwill and intangibles)	4,321		4,511
Concentration of net assets by geography:
Concentration of net assets	31,404		32,910
Other Geographic Area [Member]
Long-lived tangible assets by geography:
Long-lived assets (excluding goodwill and intangibles)	1,840	[2]	1,287	[2]
Concentration of net assets by geography:
Concentration of net assets	$ 12,781	[2]	$ 11,088	[2]

[1] Long-lived assets located in any individual country within Europe were not material to the Company's consolidated long-lived assets.

[2] Primarily Japan and India.