Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 5,401,000	$ 91,103,000	$ 91,002,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	56,995,000	44,595,000	34,463,000
Impairments	17,137,000	0	0
Product recalls	4,615,000
Net non-cash charges resulting from inventory step-up	6,835,000
Amortization of purchase premiums and accretion of purchases discount—net	1,022,000	1,166,000
Amortization of debt discount	28,822,000	22,114,000	7,969,000
Excess tax (benefit) shortfall from exercise of stock options	3,288,000	(10,443,000)	(16,421,000)
Stock-based compensation expense	29,214,000	24,223,000	17,072,000
Deferred income taxes	(221,000)	(6,011,000)	2,693,000
Other non-cash interest expense	3,121,000	2,473,000	1,342,000
Change in assets and liabilities—net of acquisition:
Accounts receivable	588,000	(2,629,000)	(3,991,000)
Merchandise inventories	(4,304,000)	(166,505,000)	(106,036,000)
Accounts payable and accrued expenses	(50,307,000)	29,196,000	22,222,000
Deferred revenue and customer deposits	23,977,000	33,213,000	19,955,000
Other current liabilities	(23,820,000)	39,580,000	(3,131,000)
Deferred rent and lease incentives	4,662,000	13,597,000	3,574,000
Other non-current obligations	8,709,000	215,000	(563,000)
Prepaid expense and other assets	(36,889,000)	10,817,000	9,093,000
Net cash provided by operating activities	78,845,000	126,704,000	79,243,000
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(157,644,000)	(119,461,000)	(110,359,000)
Acquisition of buildings and land		(13,999,000)
Construction related deposits	(23,380,000)	(20,049,000)	(9,250,000)
Purchase of trademarks and domain names	(322,000)	(339,000)	(453,000)
Purchase of investments	(248,485,000)	(217,379,000)	(91,604,000)
Maturities of investments	187,338,000	143,830,000	11,118,000
Sales of investments	37,096,000
Acquisition of business—net of cash acquired	(116,100,000)
Net cash used in investing activities	(321,497,000)	(227,397,000)	(200,548,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Gross borrowings under revolving line of credit			749,945,000
Gross repayments under revolving line of credit			(835,370,000)
Revolving line of credit deferred financing fees			(2,133,000)
Proceeds from issuance of convertible senior notes		296,250,000	350,000,000
Proceeds from issuance of warrants		30,390,000	40,390,000
Purchase of convertible note hedges		(68,250,000)	(73,325,000)
Debt issuance costs related to convertible senior notes		(2,382,000)	(5,385,000)
Borrowings under build-to-suit lease transactions			1,776,000
Proceeds from exercise of stock options	3,261,000	25,606,000	16,400,000
Excess tax benefit (shortfall) from exercise of stock options	(3,288,000)	10,443,000	16,421,000
Tax withholdings related to issuance of stock-based awards	(1,603,000)	(5,027,000)	(3,116,000)
Other financing activities	(611,000)	(248,000)	(1,803,000)
Net cash provided by (used in) financing activities	(2,241,000)	286,782,000	253,800,000
Effects of foreign currency exchange rate translation	449,000	(308,000)	(198,000)
Net increase (decrease) in cash and cash equivalents	(244,444,000)	185,781,000	132,297,000
Cash and cash equivalents
Beginning of period	331,467,000	145,686,000	13,389,000
End of period	87,023,000	331,467,000	145,686,000
Cash paid for interest	16,615,000	13,369,000	8,611,000
Cash paid for taxes	48,464,000	29,135,000	60,121,000
Non-cash transactions:
Property and equipment additions due to build-to-suit lease transactions	55,991,000	96,323,000	89,829,000
Property and equipment reduction due to effected sale leaseback (Note 6)		(74,855,000)
Property and equipment additions from use of construction related deposits	10,720,000	13,915,000
Property and equipment additions in accounts payable and accrued expenses at period-end	9,201,000	12,108,000	10,875,000
Property and equipment acquired under capital lease	$ 16,000	88,000	38,000
Building acquired under capital lease			6,798,000
Issuance of non-current notes payable related to share repurchases from former employees		238,000	$ 16,575,000
Trademarks and Domain Names [Member]
Non-cash transactions:
Property and equipment additions in accounts payable and accrued expenses at period-end		$ 107,000