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Stock-Based Compensation - Assumptions to Estimate Fair Value of Option Grants (Parenthetical) (Detail) (USD $)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Black Scholes Based Option Pricing Model | 2015 $4.61 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 4.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionFifteenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		    
Black Scholes Based Option Pricing Model | 2015 $3.85 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionTwelveMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		    
Black Scholes Based Option Pricing Model | 2015 $3.72 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionSixteenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		    
Black Scholes Based Option Pricing Model | 2014 $3.03 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionThirteenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		 $ 3.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionThirteenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		  
Black Scholes Based Option Pricing Model | 2014 $3.01 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionFourteenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		 $ 3.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionFourteenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		  
Black Scholes Based Option Pricing Model | 2013 $3.05 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionSevenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		   $ 3.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionSevenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember
Black Scholes Based Option Pricing Model | 2013 $3.02 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionEightMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		   $ 3.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionEightMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember
Black Scholes Based Option Pricing Model | 2013 $2.82 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 2.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionNineMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember		   $ 2.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionNineMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember
Black Scholes Based Option Pricing Model | 2013 $3.02 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted     $ 3.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionTenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_BlackScholesBasedOptionPricingModelMember
Monte Carlo Simulation | 2013 $3.05 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 3.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionSevenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		    
Monte Carlo Simulation | 2015 $2.49 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 2.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionThreeMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		    
Monte Carlo Simulation | 2014 $1.90 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 1.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionSixMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		 $ 1.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionSixMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		  
Monte Carlo Simulation | 2013 $3.02 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 1.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionTenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		 $ 1.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionTenMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		  
Monte Carlo Simulation | 2013 $1.86 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 1.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionOneMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		   $ 1.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_OptionOneMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember
Monte Carlo Simulation | 2013 $1.75 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 1.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionOneMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		   $ 1.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionOneMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember
Monte Carlo Simulation | 2013 $1.75 Value Per Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average value per option granted $ 1.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionTwoMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember		   $ 1.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bzc_StockOptionTwoMember
/ us-gaap_ValuationTechniqueAxis
= bzc_MonteCarloSimulationMember