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Income Taxes (Details 1)
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12 Months Ended | ||
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2013
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| Income Tax Disclosure [Abstract] | |||
| Statutory federal income tax rate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
| Meals and entertainment | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment |
| State income tax, net of federal tax effect | 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes |
| Valuation allowance | (17.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 208.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (256.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance |
| Goodwill impairment | (18.70%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | |
| Deferred tax adjustments | (0.10%)wstl_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxes | 8.30%wstl_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxes | 1.40%wstl_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxes |
| Foreign tax credit | 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | |
| Equity compensation | (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | (6.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost | (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost |
| Capitalized transaction costs | (2.70%)wstl_EffectiveIncomeTaxRateReconciliationCapitalizedTransactionCosts | ||
| Other | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (3.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments |
| Effective income tax rate | 0.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 242.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations | (223.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations |
| X | ||||||||||
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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 changes in the valuation allowance for deferred tax assets. 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 statutory income tax expense (benefit) outside of the country of domicile. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 impairment loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 meals and entertainment expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 equity-based compensation costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 other adjustments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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 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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- Details
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- Definition
Effective Income Tax Rate Reconciliation, Capitalized Transaction Costs No definition available.
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- Definition
effective income tax rate reconciliation change in deferred taxes No definition available.
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