Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 73,270	$ 83,772
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	22,305,464	21,083,972