Subsequent Event - Additional Information (Detail) - USD ($)		3 Months Ended
	May 02, 2017	Jul. 29, 2017	Apr. 29, 2017	Apr. 30, 2016
Subsequent Event [Line Items]
Stock-based compensation expense			$ 5,289,000	$ 3,998,000
Performance-Based Restrictions [Member]
Subsequent Event [Line Items]
Common stock, lapse description			The stock price objectives are measured each year and are set at prices for the Company’s common stock of $100, $125 and $150 per share. If all three stock price objectives are met in the first performance year, restrictions will lapse as to 250,000 shares in aggregate at the end of such year, with 83,333 shares tied to a $100 price per share, 83,333 shares tied to a $125 price per share and 83,334 shares tied to a $150 price per share. The same price performance tests are applied in the second year of performance such that restrictions will lapse for an additional 250,000 shares at the end of the second year and then again as to an additional 250,000 shares at the end of each of the third and fourth years so long as Mr. Friedman remains employed at the end of each year.
Time-Based Restrictions and Performance-Based Restrictions [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Stock-based compensation expense		$ 24,000,000
Subsequent Event [Member] | Performance-Based Restrictions [Member] | Common Stock Achieving Price per Share of $100 [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	83,333
Exercise price of option granted	$ 100
Subsequent Event [Member] | Performance-Based Restrictions [Member] | Common Stock Achieving Price per Share of $125 [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	83,333
Exercise price of option granted	$ 125
Subsequent Event [Member] | Performance-Based Restrictions [Member] | Common Stock Achieving Price per Share of $150 [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	83,334
Exercise price of option granted	$ 150
Subsequent Event [Member] | Performance-Based Restrictions [Member] | First Performance Year [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	250,000
Subsequent Event [Member] | Performance-Based Restrictions [Member] | Second Performance Year [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	250,000
Subsequent Event [Member] | Performance-Based Restrictions [Member] | Third Performance Year [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	250,000
Subsequent Event [Member] | Performance-Based Restrictions [Member] | Fourth Performance Year [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	250,000
Chairman and Chief Executive Officer [Member] | Stock Options [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Option to purchase of common stock	1,000,000
Exercise price of option granted	$ 50
Chairman and Chief Executive Officer [Member] | Time Based Restricted [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of share lapse per year	250,000
Chairman and Chief Executive Officer [Member] | Time Based Restricted [Member] | Subsequent Event [Member] | Stock Options [Member]
Subsequent Event [Line Items]
Option vesting period	4 years
Chairman and Chief Executive Officer [Member] | Performance Based Restricted [Member] | Stock Options [Member]
Subsequent Event [Line Items]
Expected vested exercise price description			performance-based restrictions linked to achieving the Company’s common stock price objectives of $100, $125 and $150 per share
Board of Directors [Member] | Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Stock repurchase program authorized amount	$ 700,000,000