Consolidated Statement Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Treasury stock	Retained earnings	Accumulated other comprehensive income (loss)
Common Stock, Shares, Issued at Jan. 31, 2017	59,246,000
Common Stock, Shares, Issued at Jan. 31, 2018	59,246,000
Balance at Jan. 31, 2017	$ 2,169,888	$ 89	$ 686,042	$ (1,070,994)	$ 2,629,293	$ (74,542)
Increase (Decrease) in Stockholders' Equity
Issuance of treasury stock to acquire business	247,232	0	123,032	124,200	0	0
Issuance of treasury stock for benefit plan and equity-based awards exercised	(4,484)	0	(11,154)	6,670	0	0
Stock-based compensation expense	29,381	0	29,381	0	0	0
Other comprehensive (loss) income, net of tax	362,834	0	0	0	0	362,834
Net income	116,641	0	0	0	116,641	0
Balance at Jan. 31, 2018	$ 2,921,492	89	827,301	(940,124)	2,745,934	288,292
Common Stock, Shares, Issued at Jan. 31, 2019	59,246,000
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock	$ (107,025)	0	0	(107,025)	0	0
Issuance of treasury stock to acquire business	0
Issuance of treasury stock for benefit plan and equity-based awards exercised	(5,331)	0	(14,608)	9,277	0	0
Stock-based compensation expense	31,513	0	31,513	0	0	0
Other comprehensive (loss) income, net of tax	(244,506)	0	0	0	0	(244,506)
Net income	340,580	0	0	0	340,580	0
Balance at Jan. 31, 2019	$ 2,936,723	89	844,206	(1,037,872)	3,086,514	43,786
Common Stock, Shares, Issued at Jan. 31, 2020	59,246,000
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock	$ (170,191)	0	0	(170,191)	0	0
Issuance of treasury stock to acquire business	0
Issuance of treasury stock for benefit plan and equity-based awards exercised	(7,768)	0	(17,699)	9,931	0	0
Stock-based compensation expense	32,187	0	32,187	0	0	0
Adjustments to Additional Paid in Capital, Other	(3,674)	0	(3,674)	0	0	0
Other comprehensive (loss) income, net of tax	(42,322)	0	0	0	0	(42,322)
Net income	374,500	0	0	0	374,500	0
Balance at Jan. 31, 2020	$ 3,119,455	$ 89	$ 855,020	$ (1,198,132)	$ 3,461,014	$ 1,464