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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, 2019	Jan. 31, 2018	Jan. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 18,104	$ 14,517	$ 18,291
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		1,854	897	1,002
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		4	142	240
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	[1]	2,463	3,562	12,349
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 13,783	$ 9,916	$ 4,700
[1] Includes: (i) 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; (ii) 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; and (iii) the reversal of $7,908 of previously recognized compensation expense in fiscal 2017, related to 505,510 PSU’s that will not vest as the achievement of the related performance target is not probable.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ 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=109223946&loc=d3e3602-108585

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- Definition

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+ References

No definition available.

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