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Stock-Based Compensation (Details 1)
12 Months Ended
Jan. 31, 2017
$ / shares
shares
Schedule of outstanding and exercisable stock options  
Number Outstanding | shares 859,358
Weighted-Average Remaining Contractual Life (years) 5 years 8 months 12 days
Outstanding stock options, weighted Average Exercise Price $ 29.83
Number Exercisable | shares 482,255
Exercisable stock options, Weighted-Average Exercise Price $ 28.91
Range One  
Schedule of outstanding and exercisable stock options  
Minimum Range of Exercise Price 21.03
Maximum Range of Exercise Price $ 24.02
Number Outstanding | shares 93,750
Weighted-Average Remaining Contractual Life (years) 3 years 4 months 24 days
Outstanding stock options, weighted Average Exercise Price $ 22.09
Number Exercisable | shares 68,750
Exercisable stock options, Weighted-Average Exercise Price $ 22.29
Range Two  
Schedule of outstanding and exercisable stock options  
Minimum Range of Exercise Price 24.03
Maximum Range of Exercise Price $ 27.02
Number Outstanding | shares 183,612
Weighted-Average Remaining Contractual Life (years) 5 years 2 months 12 days
Outstanding stock options, weighted Average Exercise Price $ 26.59
Number Exercisable | shares 183,612
Exercisable stock options, Weighted-Average Exercise Price $ 26.59
Range Three  
Schedule of outstanding and exercisable stock options  
Minimum Range of Exercise Price 27.03
Maximum Range of Exercise Price $ 30.02
Number Outstanding | shares 175,346
Weighted-Average Remaining Contractual Life (years) 9 years 2 months 12 days
Outstanding stock options, weighted Average Exercise Price $ 27.74
Range Four  
Schedule of outstanding and exercisable stock options  
Minimum Range of Exercise Price 30.03
Maximum Range of Exercise Price $ 33.02
Number Outstanding | shares 293,570
Weighted-Average Remaining Contractual Life (years) 5 years 7 months 6 days
Outstanding stock options, weighted Average Exercise Price $ 30.98
Number Exercisable | shares 196,040
Exercisable stock options, Weighted-Average Exercise Price $ 31.28
Range Five  
Schedule of outstanding and exercisable stock options  
Minimum Range of Exercise Price 33.03
Maximum Range of Exercise Price $ 42.02
Number Outstanding | shares 29,780
Weighted-Average Remaining Contractual Life (years) 7 years 4 months 24 days
Outstanding stock options, weighted Average Exercise Price $ 40.52
Number Exercisable | shares 19,853
Exercisable stock options, Weighted-Average Exercise Price $ 40.52
Range Six  
Schedule of outstanding and exercisable stock options  
Minimum Range of Exercise Price 42.03
Maximum Range of Exercise Price $ 45.02
Number Outstanding | shares 83,300
Weighted-Average Remaining Contractual Life (years) 7 years 2 months 12 days
Outstanding stock options, weighted Average Exercise Price $ 42.12
Number Exercisable | shares 14,000
Exercisable stock options, Weighted-Average Exercise Price $ 42.12