Segment Information (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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Verizon [Member] | |||
Revenue, Major Customer [Line Items] | |||
Percentage Of Net Revenue |
30.50%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_VerizonMember |
23.90%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_VerizonMember |
17.10%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_VerizonMember |
Telamon [Member] | |||
Revenue, Major Customer [Line Items] | |||
Percentage Of Net Revenue |
5.80%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TelamonMember |
30.30%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TelamonMember |
12.40%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TelamonMember |
Time Warner Cable [Member] | |||
Revenue, Major Customer [Line Items] | |||
Percentage Of Net Revenue |
2.60%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TimeWarnerCableMember |
2.30%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TimeWarnerCableMember |
10.40%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TimeWarnerCableMember |
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