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Variable Interest Entity (Details) (USD $)
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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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| Concentration Risk [Line Items] | ||||||
| Revenue | $ 84,127,000us-gaap_SalesRevenueNet | $ 102,073,000us-gaap_SalesRevenueNet | $ 38,808,000us-gaap_SalesRevenueNet | |||
| Accounts receivable | 11,845,000us-gaap_AccountsReceivableNetCurrent | 15,831,000us-gaap_AccountsReceivableNetCurrent | [1] | |||
| Guarantor Obligations, Maximum Exposure, Undiscounted | 700,000us-gaap_GuaranteeObligationsMaximumExposure | |||||
| AKA [Member] | ||||||
| Concentration Risk [Line Items] | ||||||
| Equity Method Investment, Ownership Percentage |
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
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| Equity Method Investments |
100,000us-gaap_EquityMethodInvestments / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
100,000us-gaap_EquityMethodInvestments / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
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| Revenue |
1,700,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
4,500,000us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
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| Accounts receivable |
400,000us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
400,000us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
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| Deferred Revenue |
$ 1,100,000us-gaap_DeferredRevenue / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
$ 1,000,000us-gaap_DeferredRevenue / us-gaap_ConcentrationRiskByTypeAxis = wstl_AKAMember |
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| X | ||||||||||
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- Definition
Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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