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Goodwill and Intangible Assets (Details 2) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Intangible assets, net |  |  |
Carrying Amount | $ 22,595,000 | $ 14,395,000 |
Accumulated Amortization | 7,177,000 | 4,576,000 |
Net | 15,418,000 | 9,819,000 |
Estimated amortization expense |  |  |
2014 | 2,355,000 |  |
2015 | 2,324,000 |  |
2016 | 2,304,000 |  |
2017 | 2,186,000 |  |
2018 | 2,043,000 |  |
Additional disclosure |  |  |
Amortization expense | 2,601,000 | 1,490,000 | 1,183,000
Impairment loss |  | 350,000 |
Intellectual property |  |  |
Intangible assets, net |  |  |
Carrying Amount | 4,991,000 | 4,091,000 |
Accumulated Amortization | 1,037,000 | 542,000 |
Net | 3,954,000 | 3,549,000 |
Intellectual property | Minimum |  |  |
Intangible assets, net |  |  |
Useful Life | 10 years | 10 years |
Intellectual property | Maximum |  |  |
Intangible assets, net |  |  |
Useful Life | 16 years | 16 years |
Trade names |  |  |
Intangible assets, net |  |  |
Carrying Amount | 2,296,000 | 1,596,000 |
Accumulated Amortization | 248,000 | 27,000 |
Net | 2,048,000 | 1,569,000 |
Useful Life | 10 years | 10 years |
Customer relationships |  |  |
Intangible assets, net |  |  |
Carrying Amount | 14,485,000 | 8,185,000 |
Accumulated Amortization | 5,345,000 | 3,555,000 |
Net | 9,140,000 | 4,630,000 |
Customer relationships | Minimum |  |  |
Intangible assets, net |  |  |
Useful Life | 7 years | 7 years |
Customer relationships | Maximum |  |  |
Intangible assets, net |  |  |
Useful Life | 8 years 6 months | 8 years 6 months |
Non-compete agreements |  |  |
Intangible assets, net |  |  |
Carrying Amount | 823,000 | 523,000 |
Accumulated Amortization | 547,000 | 452,000 |
Net | $ 276,000 | $ 71,000 |
Non-compete agreements | Minimum |  |  |
Intangible assets, net |  |  |
Useful Life | 3 years | 3 years |
Non-compete agreements | Maximum |  |  |
Intangible assets, net |  |  |
Useful Life | 5 years | 5 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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