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Stock Award Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended
Jan. 31, 2015
Jul. 31, 2014
Jan. 31, 2014
Oct. 11, 2011
Jul. 31, 2013
Class of Stock [Line Items]          
Term of the award plan 5 years        
Share-based award, vesting period 3 years        
Excess tax benefits accumulated in Capital in Excess of Par Value $ 0.1us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation $ 0.1us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation      
Maximum [Member]          
Class of Stock [Line Items]          
Compensation expense 0.1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		   0.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Unrecognized compensation expense 0.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Class A [Member]          
Class of Stock [Line Items]          
Shares awarded (in shares)       62,099us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 16,387us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Shares awarded, value       $ 0.9us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 0.2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember