Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Allowance for Doubtful Accounts Receivable, Current	$ 5,331	$ 4,432
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	300,000	300,000
Common stock, shares issued	112,902	109,346
Common stock, shares outstanding	112,902	109,346