Consolidated Statement Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Income Statement [Abstract]
Net sales	$ 5,887,229us-gaap_SalesRevenueNet	$ 6,728,151us-gaap_SalesRevenueNet
Cost of products sold	5,595,340us-gaap_CostOfGoodsSold	6,392,823us-gaap_CostOfGoodsSold
Gross profit	291,889us-gaap_GrossProfit	335,328us-gaap_GrossProfit
Selling, general and administrative expenses	247,481	291,596
Restatement and remediation related expenses (Note 1)	618	12,236
LCD settlements (Note 1)	38,511	0
Loss on disposal of subsidiaries	363us-gaap_BusinessExitCosts1	0us-gaap_BusinessExitCosts1
Operating expenses:	209,951us-gaap_OperatingExpenses	303,832us-gaap_OperatingExpenses
Operating income	81,938us-gaap_OperatingIncomeLoss	31,496us-gaap_OperatingIncomeLoss
Interest expense	5,722us-gaap_InterestExpense	6,760us-gaap_InterestExpense
Other expense, net	161us-gaap_OtherNonoperatingIncomeExpense	451us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	76,055	24,285
Provision for income taxes	24,778us-gaap_IncomeTaxExpenseBenefit	10,818us-gaap_IncomeTaxExpenseBenefit
Net income	$ 51,277us-gaap_ProfitLoss	$ 13,467us-gaap_ProfitLoss
Net income per share:
Basic	$ 1.39us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic
Diluted	$ 1.38us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic	36,822	38,137
Diluted	37,036	38,321

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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