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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 85,135 | $ 91,297 |
Less: accumulated depreciation and amortization |  | (52,783) | (54,699) |
Net book value |  | 32,352 | 36,598 |
Net value of computer software included in furniture, fixture and equipment |  | 57 | 106 |
Impairment of property, plant and equipment |  |  |  | $ 490
Depreciation of property, plant and equipment |  | 2,373 | 2,824 | $ 3,621
Long Term Leased Land And Buildings [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost | [1] | $ 4,156 | 4,181 |
Lease terms |  | 50 years |  |
Lease expiration period |  | Dec. 31, 2053 |  |
Use Rights [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost | [2] | $ 27,771 | 29,534 |
Lease terms |  | 50 years |  |
Lease expiration period |  | Dec. 31, 2050 |  |
Vehicles [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | $ 1,369 | 1,600 |
Land, Buildings and Improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 31,927 | 33,715 |
Machinery and Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 41,062 | 45,676 |
Furniture and Fixtures [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 11,734 | 12,230 |
Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 2,510 | 2,855 |
Construction in Progress [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  |  | 91 |
Property Subject to Operating Lease [Member] | Land, Buildings and Improvements [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cost |  | 8,099 | 2,513 |
Less: accumulated depreciation and amortization |  | (1,896) | (480) |
Net book value |  | $ 6,203 | $ 2,033 |
[1] | Long term leased land and buildings erected thereon represent land and buildings on collectively-owned land located in the PRC on which an upfront lump-sum payment has been made for the right to use the land and building for a term of 50 years to 2053. Dongguan Chang An Xiaobian District Co-operation, the lessor, is the entity to whom the collectively-owned land has been granted. According to existing PRC laws and regulations, collectively-owned land is not freely transferable unless certain application and approval procedures are fulfilled by the Dongguan Chang An Xiaobian District Co-operation to change the legal form of the land from collectively-owned to state-owned. As of March 31, 2016, the Company is not aware of any steps being taken by the Dongguan Chang An Xiaobian District Co-operation for such application.
[2] | The land use rights of state-owned land and buildings erected thereon represent land and buildings located in the PRC on which an upfront lump-sum payment has been made for the right to use the land and building with lease terms of 50 years expiring in 2050.

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 + Details
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