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Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Income Statement [Abstract]
Total revenue	$ 1,671,961us-gaap_SalesRevenueNet	$ 1,790,055us-gaap_SalesRevenueNet	$ 6,113,358us-gaap_SalesRevenueNet	$ 5,920,689us-gaap_SalesRevenueNet
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	1,320,915us-gaap_CostOfGoodsSold	1,513,365us-gaap_CostOfGoodsSold	5,020,116us-gaap_CostOfGoodsSold	4,982,293us-gaap_CostOfGoodsSold
Gross profit	351,046us-gaap_GrossProfit	276,690us-gaap_GrossProfit	1,093,242us-gaap_GrossProfit	938,396us-gaap_GrossProfit
Operating expenses	238,782us-gaap_OperatingExpenses	214,671us-gaap_OperatingExpenses	727,881us-gaap_OperatingExpenses	647,174us-gaap_OperatingExpenses
Depreciation and amortization	40,431us-gaap_DepreciationAndAmortization	32,687us-gaap_DepreciationAndAmortization	113,955us-gaap_DepreciationAndAmortization	95,604us-gaap_DepreciationAndAmortization
Interest, net	10,191us-gaap_InterestExpense	10,123us-gaap_InterestExpense	31,057us-gaap_InterestExpense	29,595us-gaap_InterestExpense
Income before income taxes	61,642us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	19,209us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	220,349us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	166,023us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal and state income taxes	22,323us-gaap_IncomeTaxExpenseBenefit	6,556us-gaap_IncomeTaxExpenseBenefit	81,064us-gaap_IncomeTaxExpenseBenefit	60,145us-gaap_IncomeTaxExpenseBenefit
Net income	$ 39,319us-gaap_NetIncomeLoss	$ 12,653us-gaap_NetIncomeLoss	$ 139,285us-gaap_NetIncomeLoss	$ 105,878us-gaap_NetIncomeLoss
Net income per common share
Basic (in dollars per share)	$ 1.01us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 3.60us-gaap_EarningsPerShareBasic	$ 2.76us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.01us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 3.57us-gaap_EarningsPerShareDiluted	$ 2.73us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding (in shares)	38,795,477us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,482,970us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,701,232us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,443,816us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus effect of stock compensation (in shares)	322,674us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	444,061us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	309,125us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	418,025us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average shares outstanding (in shares)	39,118,151us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,927,031us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,010,357us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,861,841us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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