Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended
	May 01, 2011	May 02, 2010
Condensed Consolidated Statements of Income and Comprehensive Income [Abstract]
Merchandise sales	$ 1,314,349	$ 1,233,595
Services sales	167,096	153,287
Other revenue	8,921	8,271
Net sales	1,490,366	1,395,153
Cost of merchandise sales	919,476	869,842
Cost of services sales	120,554	112,748
Cost of other revenue	8,921	8,271
Total cost of sales	1,048,951	990,861
Gross profit	441,415	404,292
Operating, general and administrative expenses	319,732	301,031
Operating income	121,683	103,261
Interest expense, net	(14,447)	(15,343)
Income before income tax expense and equity in income from Banfield	107,236	87,918
Income tax expense	(38,906)	(33,764)
Equity in income from Banfield	2,575	1,438
Net income	70,905	55,592
Other comprehensive income, net of income tax:
Foreign currency translation adjustments	2,774	2,417
Comprehensive income	$ 73,679	$ 58,009
Earnings per common share:
Basic	$ 0.62	$ 0.47
Diluted	$ 0.61	$ 0.46
Weighted average shares outstanding:
Basic	113,541	117,976
Diluted	115,699	120,382