CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2012	Jan. 31, 2012
Accounts receivable, less allowance for doubtful accounts	$ 50,028	$ 52,713
Common stock, par value	$ 0.0015	$ 0.0015
Common stock ,Shares authorized	200,000,000	200,000,000
Common stock Shares issued	59,239,085	59,239,085
Treasury stock ,shares	21,484,292	18,166,761