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Equity Incentive Awards - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 01, 2019	Feb. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during the period (in shares)			2,927,923
Contractual term (in years)			10 years
Options issued (in shares)			6,270	6,930	7,550
Options issued (in usd per share)			$ 89.65	$ 81.15	$ 74.53
Proceeds from stock options exercised			$ 3.8	$ 4.9	$ 11.3
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)		70,250	192,505	130,426	133,717
Share based compensation, fair market value		$ 5.9
Share based compensation expense, restricted stock grant			$ 10.0	$ 9.4	$ 9.2
Share based compensation expense to be recognized			$ 11.0
Period for recognition of cost not recognized (in years)			1 year 2 months 12 days
Management \| Transition Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)		70,250
Share based compensation, fair market value		$ 5.9
Vesting period (in years)		3 years
Management \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)		3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares of common stock available for grant (in shares)			3,750,000
Vesting period (in years)			3 years 6 months
Vests on May 8, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percentage)			33.33%
Vests on May 8, 2017 \| Transition Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percentage)			67.00%
Vests on November 8, 2017 \| Transition Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percentage)			33.00%
Vests on May 8, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights (in percentage)			33.33%
Subsequent Event \| Management \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)	61,200