Consolidated Balance Sheet (Parenthetical) - USD ($)	Apr. 30, 2020	Jan. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 80,400,000	$ 79,440,000
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	23,587,200	23,819,230