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Employee and Director Stock Plans - Options Outstanding and Exercisable (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Vested and Exercisable, Number of Shares (in shares) 156,400  
Options Vested and Exercisable, Weighted average contractual life (in years) 2 years 7 months 6 days  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 37.10  
Options Vested and Exercisable, Aggregate intrinsic value $ 17.2  
Options Outstanding, Number of Shares (in shares) 817,100 200,000
Options Outstanding, Weighted average contractual life (in years) 7 years 8 months 12 days  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 23.95 $ 40.49
Options Outstanding, Aggregate intrinsic value $ 100.7  
$2.90 - $16.12    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) $ 2.90  
Range of per-share exercise prices, upper limit (in dollars per share) $ 16.12  
Options Vested and Exercisable, Number of Shares (in shares) 2,600  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 9.51  
Options Outstanding, Number of Shares (in shares) 122,700  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 14.62  
$19.32 - $20.65    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 19.32  
Range of per-share exercise prices, upper limit (in dollars per share) $ 20.65  
Options Vested and Exercisable, Number of Shares (in shares) 5,400  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 20.03  
Options Outstanding, Number of Shares (in shares) 85,700  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 20.19  
$21.13 - $21.13    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 21.13  
Range of per-share exercise prices, upper limit (in dollars per share) $ 21.13  
Options Vested and Exercisable, Number of Shares (in shares) 2,800  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 21.13  
Options Outstanding, Number of Shares (in shares) 292,900  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 21.13  
$21.32 - $21.32    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 21.32  
Range of per-share exercise prices, upper limit (in dollars per share) $ 21.32  
Options Vested and Exercisable, Number of Shares (in shares) 11,700  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 21.32  
Options Outstanding, Number of Shares (in shares) 85,100  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 21.32  
$22.17 - $31.88    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 22.17  
Range of per-share exercise prices, upper limit (in dollars per share) $ 31.88  
Options Vested and Exercisable, Number of Shares (in shares) 8,500  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 25.58  
Options Outstanding, Number of Shares (in shares) 105,300  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 27.50  
$32.58 - $33.92    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 32.58  
Range of per-share exercise prices, upper limit (in dollars per share) $ 33.92  
Options Vested and Exercisable, Number of Shares (in shares) 4,000.0  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 33.82  
Options Outstanding, Number of Shares (in shares) 4,000.0  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 33.82  
$36.06 - $36.06    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 36.06  
Range of per-share exercise prices, upper limit (in dollars per share) $ 36.06  
Options Vested and Exercisable, Number of Shares (in shares) 2,500  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 36.06  
Options Outstanding, Number of Shares (in shares) 2,500  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 36.06  
$36.44 - $36.44    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 36.44  
Range of per-share exercise prices, upper limit (in dollars per share) $ 36.44  
Options Vested and Exercisable, Number of Shares (in shares) 5,200  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 36.44  
Options Outstanding, Number of Shares (in shares) 5,200  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 36.44  
$38.55 - $38.55    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of per-share exercise prices, lower limit (in dollars per share) 38.55  
Range of per-share exercise prices, upper limit (in dollars per share) $ 38.55  
Options Vested and Exercisable, Number of Shares (in shares) 1,400  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 38.55  
Options Outstanding, Number of Shares (in shares) 1,400  
Options Outstanding, Weighted average exercise price per share (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 (in dollars per share) 41.62  
Range of per-share exercise prices, upper limit (in dollars per share) $ 41.62  
Options Vested and Exercisable, Number of Shares (in shares) 112,300  
Options Vested and Exercisable, Weighted average exercise price per share (in dollars per share) $ 41.62  
Options Outstanding, Number of Shares (in shares) 112,300  
Options Outstanding, Weighted average exercise price per share (in dollars per share) $ 41.62