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Income Taxes - Summary of Federal Statutory Rate and Provision for Income (Detail) (USD $)
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3 Months Ended | 12 Months Ended | ||
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Dec. 27, 2014
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Dec. 28, 2013
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Dec. 27, 2014
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Dec. 28, 2013
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| Income Tax Disclosure [Abstract] | ||||
| Income tax at federal rate | $ 348,642us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 456,885us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | ||
| State tax, net of Federal effect | 43,334us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 56,788us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | ||
| Permanent Differences: | ||||
| Meals & Entertainment | 21,722us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | 20,792us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | ||
| Officers Life Insurance | 1,337us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | 1,337us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | ||
| Charitable Contribution C/F | (646)us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions | |||
| Domestic Production Activities Deduction | (22,017)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (25,954)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | ||
| Total Permanent Differences | 1,042us-gaap_IncomeTaxReconciliationNondeductibleExpense | (4,471)us-gaap_IncomeTaxReconciliationNondeductibleExpense | ||
| NOL Deduction | (27,192)dvly_EffectiveIncomeTaxRateReconciliationNetOperatingLossAdjustments | |||
| Total Tax Credits | (27,214)us-gaap_IncomeTaxReconciliationTaxCredits | (20,068)us-gaap_IncomeTaxReconciliationTaxCredits | ||
| Prior Period over/under accrual | 8,475us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | 66,612us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | ||
| Rounding | (1)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (8)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | ||
| Provision for income taxes | $ 176,737us-gaap_IncomeTaxExpenseBenefit | $ 327,762us-gaap_IncomeTaxExpenseBenefit | $ 374,278us-gaap_IncomeTaxExpenseBenefit | $ 528,546us-gaap_IncomeTaxExpenseBenefit |
| Income tax at federal rate, percentage | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | ||
| State tax, net of Federal effect, percentage | 4.23%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 4.23%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | ||
| Permanent Differences: | ||||
| Meals & Entertainment, percentage | 2.12%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | 1.55%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | ||
| Officers Life Insurance, percentage | 0.13%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance | 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance | ||
| Charitable Contribution C/F, percentage | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions | (0.05%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCharitableContributions | ||
| Domestic Production Activities Deduction, percentage | (2.15%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | (1.94%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | ||
| Total Permanent Differences, percentage | 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | (0.34%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | ||
| NOL Deduction, percentage | 0.00%dvly_EffectiveIncomeTaxRateReconciliationNetOperatingLossAdjustment | (2.02%)dvly_EffectiveIncomeTaxRateReconciliationNetOperatingLossAdjustment | ||
| Total Tax Credits, percentage | (2.65%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits | (1.49%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits | ||
| Prior Period over/under accrual, percentage | 0.82%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | 4.95%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | ||
| Rounding, percentage | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent | ||
| Total Provision, percentage | 36.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 39.33%us-gaap_EffectiveIncomeTaxRateContinuingOperations | ||
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- Definition
Effective income tax rate reconciliation net operating loss adjustment. No definition available.
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- Definition
Effective income tax rate reconciliation net operating loss adjustments. No definition available.
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- Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to charitable contributions expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to life insurance expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to meals and entertainment expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments. No definition available.
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| X | ||||||||||
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible charitable contributions expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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