Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2012	Jan. 31, 2012
Consolidated Balance Sheet [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 51,895	$ 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	18,561,895	18,166,761