Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 29, 2012	Jul. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 173,203	$ 132,085
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	119,777	119,595
Loss on disposal of property and equipment	3,342	4,659
Stock-based compensation expense	14,628	13,627
Deferred income taxes	9,302	2,373
Equity in income from Banfield	(6,976)	(5,358)
Dividend received from Banfield	13,860	15,960
Excess tax benefits from stock-based compensation	(13,892)	(6,977)
Non-cash interest expense	478	363
Changes in assets and liabilities:
Merchandise inventories	(46,967)	(21,650)
Other assets	(64,768)	(46,244)
Accounts payable	44,926	8,175
Accrued payroll, bonus and employee benefits	(17,458)	(15,941)
Other liabilities	23,916	4,579
Net cash provided by operating activities	253,371	205,246
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investments	(4,027)	(15,661)
Proceeds from maturities of investments	11,915	3,240
Proceeds from sales of investments	1,059	838
Increase in restricted cash	(1,727)
Cash paid for property and equipment	(71,011)	(51,186)
Proceeds from sales of property and equipment	1,334	212
Net cash used in investing activities	(62,457)	(62,557)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from common stock issued under stock incentive plans	37,288	30,009
Minimum statutory withholding requirements	(22,466)	(6,474)
Cash paid for treasury stock	(221,611)	(165,382)
Payments of capital lease obligations	(32,103)	(26,947)
Increase in bank overdraft	3,978	12,738
Excess tax benefits from stock-based compensation	13,892	6,977
Cash dividends paid to stockholders	(30,590)	(28,611)
Net cash used in financing activities	(251,612)	(177,690)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(183)	2,232
DECREASE IN CASH AND CASH EQUIVALENTS	(60,881)	(32,769)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	342,892	291,949
CASH AND CASH EQUIVALENTS AT END OF PERIOD	282,011	259,180
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	27,790	29,103
Income taxes paid, net of refunds	123,508	100,201
Assets acquired using capital lease obligations	12,468	21,028
Accruals and accounts payable for capital expenditures	$ 31,589	$ 18,368