Stock Options Vested and Expected to Vest (Detail) (USD $)	12 Months Ended
	Feb. 02, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	355,618
Exercise Prices $30.60
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	136,741
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 6 days
Weighted Average Exercise Price	$ 30.60
Exercise Prices $50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	43,200
Weighted Average Remaining Contractual Life (Years)	8 years 6 months
Weighted Average Exercise Price	$ 50.00
Exercise Prices $65.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	30,933
Weighted Average Remaining Contractual Life (Years)	9 years 6 months
Weighted Average Exercise Price	$ 65.00
Exercise Prices $120.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	37,067
Weighted Average Remaining Contractual Life (Years)	8 years 10 months 24 days
Weighted Average Exercise Price	$ 120.00
Exercise Prices $120.60
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	93,677
Weighted Average Remaining Contractual Life (Years)	4 years 9 months 18 days
Weighted Average Exercise Price	$ 120.60
Exercise Prices $270.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options	14,000
Weighted Average Remaining Contractual Life (Years)	1 month 6 days
Weighted Average Exercise Price	$ 270.00