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Stockholders' Equity - Stock Options Outstanding (Detail)
shares in Thousands
3 Months Ended
Apr. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options, Number Outstanding (in shares) | shares 25,700
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 5 years 1 month 6 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 78.81
Options Exercisable, Number of Shares (in shares) | shares 10,842
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 61.29
$0.86 to $52.30  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 0.86
Range of Exercise Prices, Maximum (in dollars per share) $ 52.30
Options, Number Outstanding (in shares) | shares 3,715
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 3 years 9 months 18 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 37.88
Options Exercisable, Number of Shares (in shares) | shares 3,215
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 42.64
$53.60 to $58.86  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 53.60
Range of Exercise Prices, Maximum (in dollars per share) $ 58.86
Options, Number Outstanding (in shares) | shares 401
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 3 years 3 months 18 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 55.97
Options Exercisable, Number of Shares (in shares) | shares 332
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 56.08
$59.34  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 59.34
Range of Exercise Prices, Maximum (in dollars per share) $ 59.34
Options, Number Outstanding (in shares) | shares 3,953
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 3 years 7 months 6 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 59.34
Options Exercisable, Number of Shares (in shares) | shares 3,172
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 59.34
$59.37 to $75.01  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 59.37
Range of Exercise Prices, Maximum (in dollars per share) $ 75.01
Options, Number Outstanding (in shares) | shares 1,224
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 4 years 10 months 24 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 70.07
Options Exercisable, Number of Shares (in shares) | shares 525
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 70.17
$75.57  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 75.57
Range of Exercise Prices, Maximum (in dollars per share) $ 75.57
Options, Number Outstanding (in shares) | shares 4,741
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 5 years 6 months
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 75.57
Options Exercisable, Number of Shares (in shares) | shares 1,335
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 75.57
$76.48 to $80.62  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 76.48
Range of Exercise Prices, Maximum (in dollars per share) $ 80.62
Options, Number Outstanding (in shares) | shares 558
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 5 years 1 month 6 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 78.59
Options Exercisable, Number of Shares (in shares) | shares 232
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 78.68
$80.99 to $122.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Minimum (in dollars per share) 80.99
Range of Exercise Prices, Maximum (in dollars per share) $ 122.82
Options, Number Outstanding (in shares) | shares 11,108
Weighted- Average Remaining Contractual Life (Years), Options Outstanding 6 years
Weighted- Average Exercise Price, Options Outstanding (in dollars per share) $ 102.62
Options Exercisable, Number of Shares (in shares) | shares 2,031
Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 81.05