Stock-Based Compensation - Summary of Company's Stock Option, Performance Share Unit and Restricted Share Activity (Detail) shares in Thousands | 6 Months Ended |
Jul. 31, 2016$ / sharesshares |
Stock Options [Member] | |
Number | |
Number of Stock Options, Beginning Balance (in shares) | shares | 867 |
Number of Stock Options, Granted (in shares) | shares | 406 |
Number of Stock Options, Exercised/vested (in shares) | shares | 152 |
Number of Stock Options, Forfeited (in shares) | shares | 122 |
Number of Stock Options, Ending Balance (in shares) | shares | 999 |
Number of Stock Options, Exercisable (in shares) | shares | 163 |
Weighted-Average Exercise Price | |
Weighted-Average Exercise Price, Options, Beginning Balance (in dollars per share) | $ / shares | $ 49.54 |
Weighted-Average Exercise Price, Options, Granted (in dollars per share) | $ / shares | 68.68 |
Weighted-Average Exercise Price, Options, Exercised/vested (in dollars per share) | $ / shares | 33.43 |
Weighted-Average Exercise Price, Options, Forfeited (in dollars per share) | $ / shares | 57.51 |
Weighted-Average Exercise Price, Options, Ending Balance (in dollars per share) | $ / shares | 58.79 |
Weighted-Average Exercise Price, Options, Exercisable (in dollars per share) | $ / shares | $ 50.34 |
Performance-Based Restricted Stock Units [Member] | |
Number of Performance-Based Restricted Stock Units and Restricted Shares | |
Number of Units/Shares, Beginning Balance (in shares) | shares | 395 |
Number of Units/Shares, Granted (in shares) | shares | 156 |
Number of Units/Shares, Exercised/vested (in shares) | shares | 4 |
Number of Units/Shares, Forfeited (in shares) | shares | 134 |
Number of Units/Shares, Ending Balance (in shares) | shares | 413 |
Weighted-Average Grant Date Fair Value | |
Weighted-Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares | $ 58.58 |
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares | 68.68 |
Weighted-Average Grant Date Fair Value, Exercised/vested (in dollars per share) | $ / shares | 64.96 |
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares | 62.74 |
Weighted-Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares | $ 60.98 |
Restricted Shares [Member] | |
Number of Performance-Based Restricted Stock Units and Restricted Shares | |
Number of Units/Shares, Beginning Balance (in shares) | shares | 31 |
Number of Units/Shares, Granted (in shares) | shares | 17 |
Number of Units/Shares, Exercised/vested (in shares) | shares | 18 |
Number of Units/Shares, Forfeited (in shares) | shares | 0 |
Number of Units/Shares, Ending Balance (in shares) | shares | 30 |
Weighted-Average Grant Date Fair Value | |
Weighted-Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares | $ 57.67 |
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares | 69.94 |
Weighted-Average Grant Date Fair Value, Exercised/vested (in dollars per share) | $ / shares | 65.73 |
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares | 0 |
Weighted-Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares | $ 59.75 |
Restricted Stock Units [Member] | |
Number of Performance-Based Restricted Stock Units and Restricted Shares | |
Number of Units/Shares, Beginning Balance (in shares) | shares | 333 |
Number of Units/Shares, Granted (in shares) | shares | 187 |
Number of Units/Shares, Exercised/vested (in shares) | shares | 51 |
Number of Units/Shares, Forfeited (in shares) | shares | 60 |
Number of Units/Shares, Ending Balance (in shares) | shares | 409 |
Weighted-Average Grant Date Fair Value | |
Weighted-Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares | $ 55.91 |
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares | 68.49 |
Weighted-Average Grant Date Fair Value, Exercised/vested (in dollars per share) | $ / shares | 63.91 |
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares | 52.91 |
Weighted-Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares | $ 61.12 |