CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Accounts Receivable Allowances	$ 11,428	$ 9,085
Serial preferred shares without par value	$ 0.00	$ 0.00
Serial preferred shares authorized	3,000,000	3,000,000
Serial preferred shares issued	0	0
Serial preferred shares outstanding	0	0
Common shares without par value	$ 0.00	$ 0.00
Common shares authorized	300,000,000	300,000,000
Common shares issued	70,040,000	70,040,000
Common shares outstanding	57,733,000	59,122,000
Common shares held in treasury, shares	12,306,860	10,918,000