Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Cash flows from operating activities
Net income	$ 89,949	$ 42,046
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	40,586	34,860
Accretion of asset retirement obligation and closed store reserve	755	84
Amortization of financing fees and debt issuance costs	1,152	2,041
Loss on disposal of property and equipment	1,038	437
Gain on sale of intangible assets		(19)
Equity-based compensation	4,194	4,285
Non-cash loss on extinguishment of debt	1,138	17,474
Deferred income taxes	13,067	20,070
Changes in operating assets and liabilities:
Accounts receivable	(4,654)	(721)
Inventories	(21,848)	(16,383)
Prepaid expenses and other current assets	1,617	(9,752)
Other assets	(5,474)	(3,875)
Accounts payable	7,094	39,808
Accrued salaries and benefits	3,374	(469)
Other accrued liabilities and income taxes payable	5,814	(1,359)
Other long-term liabilities	13,499	9,777
Net cash provided by operating activities	151,301	138,304
Cash flows from investing activities
Purchases of property and equipment	(96,099)	(74,777)
Proceeds from sale of intangible assets		172
Proceeds from sale of property and equipment	232	2
Net cash used in investing activities	(95,867)	(74,603)
Cash flows from financing activities
Borrowing on term loan, net of financing costs		688,127
Payments on term loan	(55,250)	(745,100)
Payments on senior subordinated notes		(35,000)
Payments on capital lease obligations	(426)	(335)
Payments on financing lease obligations	(2,186)	(2,104)
Payments of deferred financing costs		(1,370)
Payments of IPO costs		(4,212)
Cash from landlord related to financing lease obligations	577	4,057
Payments to stockholders and option holders		(295,921)
Repurchase of shares		(113)
Excess tax benefit for exercise of stock options and antidilution payment to optionholders	35,041	4,402
Proceeds from the exercise of stock options	7,605	75
Proceeds from the issuance of shares		348,317
Net cash used in financing activities	(14,639)	(39,177)
Net increase in cash and cash equivalents	40,795	24,524
Cash and cash equivalents at beginning of the period	77,652	67,211
Cash and cash equivalents at the end of the period	118,447	91,735
Supplemental disclosure of cash flow information
Cash paid for interest	18,164	31,529
Cash paid for income taxes	3,982	1,276
Supplemental disclosure of non-cash investing and financing activities
Property and equipment in accounts payable	12,156	6,332
Property acquired through capital and financing lease obligations	$ 9,113	$ 10,986