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Schedule of Share-Based Compensation Expense Included in Selling, General and Administrative Expenses in Condensed Consolidated Statements of Income (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Reversal of share-based compensation expense | $ 6,509 | $ 6,509
Performance Stock Units (PSUs) | Deferred Compensation, Share-based Payments |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares, granted | 476,611 | 476,611

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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