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Fair Value Measurements Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Distributions paid | $ 0 | $ 0
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified deferred compensation asset | 6,984,000 | 6,662,000
Non-qualified deferred compensation liability | 4,128,000 | $ 4,140,000
Deferred compensation liability, current | 639,000 |
Other long term liabilities | $ 3,489,000 |

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