Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 37,091	$ 29,048
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	20,874	15,978
Amortization of debt discount	8,288	1,576
Excess tax benefit from exercise of stock options	(3,739)	(7,612)
Stock-based compensation expense	11,580	6,750
Other non-cash interest expense	1,251	431
Change in assets and liabilities:
Accounts receivable	3,128	(2,109)
Merchandise inventories	(148,310)	(93,185)
Prepaid expense and other assets	5,414	(22,369)
Accounts payable and accrued expenses	47,701	35,581
Deferred revenue and customer deposits	12,773	17,596
Other current liabilities	15,962	(12,542)
Deferred rent and lease incentives	1,548	1,064
Other non-current obligations	59	68
Net cash provided by (used in) operating activities	13,620	(29,725)
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(46,261)	(38,800)
Acquisition of building and land	(9,875)
Purchase of trademarks and domain names	(168)	(252)
Purchase of investments	(104,607)
Maturities of investments	35,000
Net cash used in investing activities	(125,911)	(39,052)
CASH FLOWS FROM FINANCING ACTIVITIES
Gross borrowings under revolving line of credit		749,945
Gross repayments under revolving line of credit		(835,370)
Proceeds from issuance of convertible senior notes	296,250	350,000
Proceeds from issuance of warrants	30,390	40,390
Purchase of convertible note hedges	(68,250)	(73,325)
Debt issuance costs related to convertible senior notes	(2,382)	(5,385)
Payments on capital leases	(137)	(1,478)
Proceeds from exercise of stock options	11,671	5,806
Excess tax benefit from exercise of stock options	3,739	7,612
Tax withholdings related to issuance of stock-based awards	(2,954)	(1,306)
Net cash provided by financing activities	268,327	236,889
Effects of foreign currency exchange rate translation	(22)	(8)
Net increase in cash and cash equivalents	156,014	168,104
Cash and cash equivalents
Beginning of period	148,934	13,389
End of period	304,948	181,493
Non-cash transactions:
Property and equipment additions due to build-to-suit lease transactions	61,597	17,536
Property and equipment additions in accounts payable and accrued expenses at period-end	19,312	13,654
Property and equipment additions from use of construction related deposits	7,327
Issuance of non-current notes payable related to share repurchases from former employees	$ 238	$ 16,575