Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2014	Jan. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 59,701	$ 58,754
Common stock, par value	$ 0.0015	$ 0.0015
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	59,245,585	59,245,585
Treasury stock, shares	21,008,013	21,177,130