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Fair Value Measurements Schedule of Fair Value Assets and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified deferred compensation asset |  | $ 7,172
Non-qualified deferred compensation liability | $ (5,378) | (4,296)
Derivative contracts asset | 7,469 |
Derivative contracts liability | (20) |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Non-qualified deferred compensation asset | 7,542 | 7,172
Non-qualified deferred compensation liability | (5,378) | (4,296)
Designated Derivative Contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative contracts asset | 6,722 | 950
Designated Derivative Contracts | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative contracts asset | 6,722 | 950
Non-Designated Derivative Contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative contracts asset | 747 |
Derivative contracts liability | (20) | (10)
Non-Designated Derivative Contracts | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative contracts asset | 747 |
Derivative contracts liability | (20) | (10)
Derivatives designated as cash flow hedges | Designated Derivative Contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative contracts liability | $ 0 | (143)
Derivatives designated as cash flow hedges | Designated Derivative Contracts | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative contracts liability |  | $ (143)

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