Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	May 31, 2014	May 31, 2013
Receivables, allowances	$ 3,043	$ 3,408
Other intangible assets, accumulated amortization	35,506	26,669
Preferred shares, without par value	$ 0	$ 0
Preferred shares, shares authorized	1,000,000	1,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common stock, without par value	$ 0	$ 0
Common shares, authorized	150,000,000	150,000,000
Common shares, shares issued	67,408,484	69,752,411
Common shares, shares outstanding	67,408,484	69,752,411
Accumulated other comprehensive income (loss), taxes	$ 8,043	$ 8,571