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Share-Based Compensation Expense Included in Selling, General and Administrative Expenses in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 21,109	$ 18,104	$ 14,517
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		1,737	1,854	897
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			4	142
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	[1]	3,483	2,463	3,562
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 15,889	$ 13,783	$ 9,916
[1] Includes: (i) the reversal of $803 of previously recognized compensation expense in fiscal 2020, related to 54,356 PSU’s that will not vest as the achievement of the related performance target is not probable; (ii) the reversal of $4,213 of previously recognized compensation expense in fiscal 2019, related to 313,077 PSU’s that will not vest as the achievement of the related performance target is not probable; and (iii) the reversal of $11,515 of previously recognized compensation expense in fiscal 2018, related to 871,779 PSU’s that will not vest as the achievement of the related performance target is not probable.

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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