Condensed Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Net sales	$ 852,416us-gaap_SalesRevenueGoodsNet	$ 635,330us-gaap_SalesRevenueGoodsNet	$ 1,774,408us-gaap_SalesRevenueGoodsNet	$ 1,435,293us-gaap_SalesRevenueGoodsNet
Cost of products sold	750,416us-gaap_CostOfGoodsAndServicesSold	565,003us-gaap_CostOfGoodsAndServicesSold	1,554,743us-gaap_CostOfGoodsAndServicesSold	1,259,783us-gaap_CostOfGoodsAndServicesSold
Gross profit	102,000us-gaap_GrossProfit	70,327us-gaap_GrossProfit	219,665us-gaap_GrossProfit	175,510us-gaap_GrossProfit
Selling, general and administrative expenses	54,302	43,766	112,291	92,107
Amortization of intangible assets	3,967us-gaap_AmortizationOfIntangibleAssets	3,226us-gaap_AmortizationOfIntangibleAssets	7,656us-gaap_AmortizationOfIntangibleAssets	6,064us-gaap_AmortizationOfIntangibleAssets
Impairment charges				710
Interest income	340us-gaap_InvestmentIncomeInterest	391us-gaap_InvestmentIncomeInterest	707us-gaap_InvestmentIncomeInterest	901us-gaap_InvestmentIncomeInterest
Interest expense	1us-gaap_InterestExpense	2us-gaap_InterestExpense	1us-gaap_InterestExpense	7us-gaap_InterestExpense
Other income, net	67us-gaap_OtherNonoperatingIncomeExpense	178us-gaap_OtherNonoperatingIncomeExpense	419us-gaap_OtherNonoperatingIncomeExpense	820us-gaap_OtherNonoperatingIncomeExpense
Income from continuing operations before income taxes	44,137	23,902	100,843	78,343
Income taxes	13,870us-gaap_IncomeTaxExpenseBenefit	6,684us-gaap_IncomeTaxExpenseBenefit	31,375us-gaap_IncomeTaxExpenseBenefit	24,731us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations	30,267	17,218	69,468	53,612
Income (loss) from discontinued operations, net of income taxes	(1,619)	(1,026)	(1,895)	3,688
Net income	28,648us-gaap_NetIncomeLoss	16,192us-gaap_NetIncomeLoss	67,573us-gaap_NetIncomeLoss	57,300us-gaap_NetIncomeLoss
Weighted average common shares outstanding:
Basic	53,377,440	53,289,626	53,355,757	53,247,315
Diluted	53,458,531	53,353,027	53,444,730	53,326,251
Earnings per common share from continuing operations:
Basic	$ 0.57	$ 0.32	$ 1.30	$ 1.01
Diluted	$ 0.57	$ 0.32	$ 1.30	$ 1.01
Earnings (loss) per common share from discontinued operations:
Basic	$ (0.03)	$ (0.02)	$ (0.03)	$ 0.07
Diluted	$ (0.03)	$ (0.02)	$ (0.04)	$ 0.06
Earnings per common share:
Basic	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 1.27us-gaap_EarningsPerShareBasic	$ 1.08us-gaap_EarningsPerShareBasic
Diluted	$ 0.54us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted	$ 1.07us-gaap_EarningsPerShareDiluted
Net income	28,648us-gaap_NetIncomeLoss	16,192us-gaap_NetIncomeLoss	67,573us-gaap_NetIncomeLoss	57,300us-gaap_NetIncomeLoss
Unrealized appreciation on investments, net of income tax				22
Comprehensive income	$ 28,648us-gaap_ComprehensiveIncomeNetOfTax	$ 16,192us-gaap_ComprehensiveIncomeNetOfTax	$ 67,573us-gaap_ComprehensiveIncomeNetOfTax	$ 57,322us-gaap_ComprehensiveIncomeNetOfTax
Regular Dividend
Earnings per common share:
Dividends paid per common share	$ 0.27	$ 0.23	$ 0.54	$ 0.46
Special Dividend
Earnings per common share:
Dividends paid per common share	$ 0.00	$ 1.00	$ 0.00	$ 1.00

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