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Employee and Director Stock Plans - Options Outstanding and Exercisable (Detail) | Jan. 31, 2018 $ / shares shares
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Options Vested and Exercisable, Number of Shares | shares | 218,800
Options Vested and Exercisable, Weighted average exercise price (in dollars per share) | $ 40.49
$28.56 - $36.44 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of per-share exercise prices, Lower Limit | 28.56
Range of per-share exercise prices, Upper Limit | $ 36.44
Options Vested and Exercisable, Number of Shares | shares | 32,600
Options Vested and Exercisable, Weighted average exercise price (in dollars per share) | $ 34.23
$38.55 - $38.55 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of per-share exercise prices, Lower Limit | 38.55
Range of per-share exercise prices, Upper Limit | $ 38.55
Options Vested and Exercisable, Number of Shares | shares | 1,800
Options Vested and Exercisable, Weighted average exercise price (in dollars per share) | $ 38.55
$41.62 - $41.62 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Range of per-share exercise prices, Lower Limit | 41.62
Range of per-share exercise prices, Upper Limit | $ 41.62
Options Vested and Exercisable, Number of Shares | shares | 184,400
Options Vested and Exercisable, Weighted average exercise price (in dollars per share) | $ 41.62

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- Definition Share Based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Limit + References No definition available. + Details
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- Definition Share Based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Limit + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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