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Available-For-Sale Securities (Narrative) (Details) (USD $)
 9 Months Ended
Feb. 28, 2015
Mar. 01, 2014
May 31, 2014
Available-For-Sale Securities [Abstract]      
Proceeds from sale of available-for-sale securities $ 109,500,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 91,400,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Gross realized gains on sales of available-for-sale securities 68,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 7,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Gross realized losses on sales of available-for-sale securities 6,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 2,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses  
Unrealized holding gains (losses) net of tax on available-for-sale securities (70,000)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax 199,000us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax  
Unrealized holding gains (losses), net of tax on available-for-sale securities included in AOCI $ 390,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax   $ 460,000us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax