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Summary of Stock Option Activity (Detail) - Stock Options - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Jan. 31, 2019 | Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding at beginning of year, Shares | 900,000 |
Granted, Shares | 140,000 |
Exercised, Shares | (430,000) |
Awards outstanding at end of year, Shares | 610,000 | 900,000
Awards outstanding fully vested and expected to vest, Shares | 610,000 |
Awards exercisable at end of year, Shares | 470,000 |
Awards outstanding at beginning of year, Weighted Average Exercise Price | $ 32.01 |
Granted, Weighted Average Exercise Price | 46.42 |
Exercised, Weighted Average Exercise Price | 31.67 |
Awards outstanding at end of year, Weighted Average Exercise Price | 35.55 | $ 32.01
Awards outstanding fully vested and expected to vest, Weighted Average Exercise Price | 35.55 |
Awards exercisable at end of year, Weighted Average Exercise Price | $ 32.31 |
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) | 3 years 10 months 24 days | 3 years 4 months 24 days
Awards outstanding fully vested and expected to vest, Weighted Average Remaining Contractual Term (years) | 3 years 10 months 24 days |
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) | 3 years 2 months 12 days |
Awards outstanding, Aggregate Intrinsic Value | $ 2,007 | $ 3,933
Awards outstanding fully vested and expected to vest, Aggregate Intrinsic Value | 2,007 |
Awards exercisable at end of year, Aggregate Intrinsic Value | $ 2,007 |

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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