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Condensed Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Net sales	$ 739,010us-gaap_SalesRevenueNet	$ 686,310us-gaap_SalesRevenueNet
Cost of sales	492,589us-gaap_CostOfGoodsAndServicesSold	447,799us-gaap_CostOfGoodsAndServicesSold
Gross profit	246,421us-gaap_GrossProfit	238,511us-gaap_GrossProfit
Selling, general and administrative expenses	193,367us-gaap_SellingGeneralAndAdministrativeExpense	178,690us-gaap_SellingGeneralAndAdministrativeExpense
Income from operations	53,054us-gaap_OperatingIncomeLoss	59,821us-gaap_OperatingIncomeLoss
Other expense, net	(2,121)us-gaap_OtherNonoperatingIncomeExpense	(344)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	50,933us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	59,477us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	18,157us-gaap_IncomeTaxExpenseBenefit	21,999us-gaap_IncomeTaxExpenseBenefit
Net income	$ 32,776us-gaap_NetIncomeLoss	$ 37,478us-gaap_NetIncomeLoss
Net income per common share:
Basic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.26us-gaap_EarningsPerShareBasic
Diluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding:
Basic	131,202,740us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	144,075,666us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	132,836,144us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	145,906,544us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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