Employee and Director Stock Plans - Options Outstanding and Exercisable (Detail) shares in Millions	Jan. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Vested and Exercisable, Number of Shares \| shares	1.6
Options Vested and Exercisable, Weighted average exercise price	$ 37.06
$12.31 - $34.70
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of per-share exercise prices, Lower Limit	12.31
Range of per-share exercise prices, Upper Limit	$ 34.70
Options Vested and Exercisable, Number of Shares \| shares	0.5
Options Vested and Exercisable, Weighted average exercise price	$ 27.34
$36.06 - $41.62
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of per-share exercise prices, Lower Limit	36.06
Range of per-share exercise prices, Upper Limit	$ 41.62
Options Vested and Exercisable, Number of Shares \| shares	0.6
Options Vested and Exercisable, Weighted average exercise price	$ 40.62
$42.39 - $43.81
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of per-share exercise prices, Lower Limit	42.39
Range of per-share exercise prices, Upper Limit	$ 43.81
Options Vested and Exercisable, Number of Shares \| shares	0.5
Options Vested and Exercisable, Weighted average exercise price	$ 43.80

Share Based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Limit

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- Definition

Share Based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Limit

+ References

No definition available.

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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.

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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=6415400&loc=d3e5070-113901

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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

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