Share-Based Payments - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions |
3 Months Ended |
8 Months Ended |
May 04, 2019 |
May 05, 2018 |
May 04, 2019 |
May 05, 2018 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Weighted average grant date fair value of options granted |
|
|
$ 208.37
|
$ 129.12
|
| Stock options granted |
|
|
172,750
|
284,335
|
| Stock options exercised - Shares |
|
|
408,657
|
243,370
|
| Stock options exercised - Weighted average exercise price |
|
|
$ 412.75
|
$ 281.72
|
| share-based compensation expense |
$ 10.0
|
$ 5.8
|
$ 31.5
|
$ 29.6
|
| Restricted Stock Units (RSUs) [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Weighted average grant date fair value of options granted |
|
|
$ 773.57
|
|
| Restricted stock units granted |
|
|
10,507
|
|
| Non vested restricted stock unit award |
$ 6.2
|
|
$ 6.2
|
|
| Estimated weighted average period |
|
|
3 years 4 months 24 days
|
|
| Stock Options [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Anti-dilutive shares excluded from the computation of earnings per share |
4,177
|
861,595
|
149,648
|
850,421
|