Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 778,182us-gaap_NetIncomeLoss	$ 670,292us-gaap_NetIncomeLoss	$ 585,746us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangibles	194,205	183,180	177,106
Amortization of debt premium, discount and issuance costs	2,086	2,054	1,788
Excess tax benefit from stock options exercised	(49,150)	(30,811)	(38,631)
Deferred income taxes	1,487us-gaap_DeferredIncomeTaxExpenseBenefit	1,919us-gaap_DeferredIncomeTaxExpenseBenefit	8,162us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation programs	23,095us-gaap_ShareBasedCompensation	21,722us-gaap_ShareBasedCompensation	22,026us-gaap_ShareBasedCompensation
Other	5,592us-gaap_OtherNoncashIncomeExpense	7,405us-gaap_OtherNoncashIncomeExpense	7,464us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable	(19,271)	(16,937)	4,404
Inventory	(179,742)us-gaap_IncreaseDecreaseInInventories	(96,876)us-gaap_IncreaseDecreaseInInventories	(276,904)us-gaap_IncreaseDecreaseInInventories
Accounts payable	360,646	127,178	645,706
Income taxes payable	32,158	24,777	71,346
Accrued payroll	12,923	5,400	7,655
Accrued benefits and withholdings	28,899	2,355	5,464
Other	(680)	6,368	30,223
Net cash provided by operating activities	1,190,430	908,026	1,251,555
Investing activities:
Purchases of property and equipment	(429,987)	(395,881)	(300,719)
Proceeds from sale of property and equipment	2,880	1,731	3,044
Payments received on notes receivable	3,705	5,396	4,157
Other	0	0	(23,889)
Net cash used in investing activities	(423,402)	(388,754)	(317,407)
Financing activities:
Proceeds from the issuance of long-term debt	0	299,976	298,881
Payment of debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	(2,967)us-gaap_PaymentsOfDebtIssuanceCosts	(2,376)us-gaap_PaymentsOfDebtIssuanceCosts
Principal payments on debt and capital leases	(72)	(224)	(935)
Repurchases of common stock	(866,484)	(933,028)	(1,445,287)
Excess tax benefit from stock options exercised	49,150	30,811	38,631
Net proceeds from issuance of common stock	69,620us-gaap_ProceedsFromStockPlans	69,350us-gaap_ProceedsFromStockPlans	63,514us-gaap_ProceedsFromStockPlans
Net cash used in financing activities	(747,786)	(536,082)	(1,047,572)
Net increase (decrease) in cash and cash equivalents	19,242	(16,810)	(113,424)
Cash and cash equivalents at beginning of year	231,318	248,128	361,552
Cash and cash equivalents at end of year	250,560	231,318	248,128
Supplemental disclosures of cash flow information:
Income taxes paid	416,458us-gaap_IncomeTaxesPaid	362,596us-gaap_IncomeTaxesPaid	274,637us-gaap_IncomeTaxesPaid
Interest paid, net of capitalized interest	$ 51,203us-gaap_InterestPaidNet	$ 46,760us-gaap_InterestPaidNet	$ 34,655us-gaap_InterestPaidNet

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Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from the stock plan during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromStockPlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration