Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Doubtful Accounts Receivable, Current	$ 79,440	$ 73,270
Common stock, par value	$ 0.0015	$ 0.0015
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	59,246,000	59,246,000
Treasury stock, shares	23,819,230	22,305,464