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Fair Value Measurements (Assets and liabilities measured at fair value on recurring bases) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable securities | $ 7,862 | $ 7,028
Marketable securities | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable securities | 7,862 | 7,028
Marketable securities | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable securities |  | 0
Marketable securities | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable securities |  | 0
Variable Annuity [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Annuity contract | 2,036 | 2,285
Variable Annuity [Member] | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Annuity contract |  | 0
Variable Annuity [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Annuity contract | 2,036 | 2,285
Variable Annuity [Member] | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Annuity contract |  | 0
Foreign exchange contracts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (64) | (70)
Foreign exchange contracts | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Foreign exchange contracts | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (64) | (70)
Foreign exchange contracts | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Term loan |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Term loan | (281,865) | (310,463)
Term loan | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Term loan |  | 0
Term loan | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Term loan | (281,865) | (310,463)
Term loan | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Term loan |  | 0
Assets [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 1,213
Assets [Member] | Interest Rate Swap [Member] | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Assets [Member] | Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 1,213
Assets [Member] | Interest Rate Swap [Member] | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Assets [Member] | Cross Currency Interest Rate Contract [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | 2,148 | 2,476
Assets [Member] | Cross Currency Interest Rate Contract [Member] | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Assets [Member] | Cross Currency Interest Rate Contract [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | 2,148 | 2,476
Assets [Member] | Cross Currency Interest Rate Contract [Member] | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Liability [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (1,531) |
Liability [Member] | Interest Rate Swap [Member] | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  |
Liability [Member] | Interest Rate Swap [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (1,531) |
Liability [Member] | Interest Rate Swap [Member] | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  |
Liability [Member] | Cross Currency Interest Rate Contract [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (8,386) | (16,184)
Liability [Member] | Cross Currency Interest Rate Contract [Member] | Quoted Prices in Active Markets for Indentical Assets (Level 1) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | 0
Liability [Member] | Cross Currency Interest Rate Contract [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (8,386) | (16,184)
Liability [Member] | Cross Currency Interest Rate Contract [Member] | Significant unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities |  | $ 0

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