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Segment Information (Details 1)
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12 Months Ended | ||
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2011
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| Revenue, Major Customer [Line Items] | |||
| Concentration Risk, Percentage | 10.00% | ||
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Verizon [Member]
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| Revenue, Major Customer [Line Items] | |||
| Entity-wide Major Customer, Percentage Of Net Revenue | 19.70% | 45.40% | 39.40% |
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CenturyLink [Member]
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| Revenue, Major Customer [Line Items] | |||
| Entity-wide Major Customer, Percentage Of Net Revenue | 6.80% | 6.00% | 11.40% |
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Frontier [Member]
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| Revenue, Major Customer [Line Items] | |||
| Entity-wide Major Customer, Percentage Of Net Revenue | 2.40% | 3.10% | 10.80% |
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Telamon [Member]
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| Revenue, Major Customer [Line Items] | |||
| Entity-wide Major Customer, Percentage Of Net Revenue | 12.00% | 8.90% | 5.30% |
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Time Warner Cable [Member]
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| Revenue, Major Customer [Line Items] | |||
| Entity-wide Major Customer, Percentage Of Net Revenue | 10.10% | 2.00% | 0.60% |
| X | ||||||||||
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- Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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- Definition
Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. No definition available.
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