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Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current expense:
Federal	$ 2,692us-gaap_CurrentFederalTaxExpenseBenefit	$ 893us-gaap_CurrentFederalTaxExpenseBenefit	$ 1,080us-gaap_CurrentFederalTaxExpenseBenefit
State	39	175	333
Total current income tax expense	2,731us-gaap_CurrentIncomeTaxExpenseBenefit	1,068us-gaap_CurrentIncomeTaxExpenseBenefit	1,413us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	(4,432)bzc_DeferredIncomeTax	2,560bzc_DeferredIncomeTax	2,063bzc_DeferredIncomeTax
Change in valuation allowance	1,278bzc_ChangeInValuationAllowance	(318)bzc_ChangeInValuationAllowance	318bzc_ChangeInValuationAllowance
Total deferred income tax expense	(3,154)us-gaap_DeferredIncomeTaxExpenseBenefit	2,242us-gaap_DeferredIncomeTaxExpenseBenefit	2,381us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	$ (423)us-gaap_IncomeTaxExpenseBenefit	$ 3,310us-gaap_IncomeTaxExpenseBenefit	$ 3,794us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.