Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Revenues:
Sales	$ 472,569us-gaap_SalesRevenueGoodsNet	$ 434,504us-gaap_SalesRevenueGoodsNet	$ 415,740us-gaap_SalesRevenueGoodsNet
Interest and other income	57,752	54,683	48,936
Total revenues	530,321us-gaap_SalesRevenueNet	489,187us-gaap_SalesRevenueNet	464,676us-gaap_SalesRevenueNet
Costs and expenses:
Cost of sales, excluding depreciation	272,446us-gaap_CostOfRevenue	251,319us-gaap_CostOfRevenue	238,984us-gaap_CostOfRevenue
Selling, general and administrative	83,802	78,591	73,180
Provision for credit losses	120,289us-gaap_ProvisionForLoanLossesExpensed	119,247us-gaap_ProvisionForLoanLossesExpensed	96,035us-gaap_ProvisionForLoanLossesExpensed
Interest expense	2,903us-gaap_InterestExpense	2,997us-gaap_InterestExpense	2,937us-gaap_InterestExpense
Depreciation and amortization	3,830us-gaap_DepreciationAndAmortization	3,285us-gaap_DepreciationAndAmortization	2,826us-gaap_DepreciationAndAmortization
Loss on disposal of property and equipment	17us-gaap_GainLossOnDispositionOfAssets	76us-gaap_GainLossOnDispositionOfAssets	58us-gaap_GainLossOnDispositionOfAssets
Total costs and expenses	483,287us-gaap_CostsAndExpenses	455,515us-gaap_CostsAndExpenses	414,020us-gaap_CostsAndExpenses
Income before income taxes	47,034	33,672	50,656
Provision for income taxes	17,544us-gaap_IncomeTaxExpenseBenefit	12,543us-gaap_IncomeTaxExpenseBenefit	18,491us-gaap_IncomeTaxExpenseBenefit
Net income	29,490us-gaap_ProfitLoss	21,129us-gaap_ProfitLoss	32,165us-gaap_ProfitLoss
Less: Dividends on mandatorily redeemable preferred stock	40	40	40
Net income attributable to common stockholders	$ 29,450	$ 21,089	$ 32,125
Earnings per share:
Basic (in Dollars per share)	$ 3.42us-gaap_EarningsPerShareBasic	$ 2.36us-gaap_EarningsPerShareBasic	$ 3.53us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 3.25us-gaap_EarningsPerShareDiluted	$ 2.25us-gaap_EarningsPerShareDiluted	$ 3.36us-gaap_EarningsPerShareDiluted
Weighted average number of shares outstanding:
Basic (in Shares)	8,617,864	8,930,592	9,111,851
Diluted (in Shares)	9,048,957	9,391,667	9,569,702

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