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Fair Value Measurements (Assets and liabilities measured at fair value on recurring bases) (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Marketable Securities, Noncurrent $ 7,229,000   $ 7,229,000     $ 7,673,000
Severance Costs     1,602,000      
Restructuring Reserve, Accrual Adjustment     839,000      
Impairment of Long-Lived Assets Held-for-use 0 $ 0 11,100,000 $ 0    
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, Noncurrent 7,229,000   7,229,000     7,673,000
Marketable securities | Significant Other Observable Inputs (Level 2)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Marketable Securities, Noncurrent 0   0     0
Marketable securities | Significant unobservable Inputs (Level 3)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Marketable Securities, Noncurrent 0   0     0
Variable Annuity [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities Related to Investment Contracts, Fair Value Disclosure 2,227,000   2,227,000     2,575,000
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]            
Liabilities Related to Investment Contracts, Fair Value Disclosure 0   0     0
Variable Annuity [Member] | Significant Other Observable Inputs (Level 2)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities Related to Investment Contracts, Fair Value Disclosure 2,227,000   2,227,000     2,575,000
Variable Annuity [Member] | Significant unobservable Inputs (Level 3)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities Related to Investment Contracts, Fair Value Disclosure 0   0     0
Foreign exchange contracts            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities (250,000)   (250,000)     107,000
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   0     0
Foreign exchange contracts | Significant Other Observable Inputs (Level 2)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities (250,000)   (250,000)     107,000
Foreign exchange contracts | Significant unobservable Inputs (Level 3)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities 0   0     0
Term loan            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term Debt, Fair Value 351,987,000   351,987,000     378,504,000
Term loan | Quoted Prices in Active Markets for Indentical Assets (Level 1)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term Debt, Fair Value 0   0     0
Term loan | Significant Other Observable Inputs (Level 2)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term Debt, Fair Value 351,987,000   351,987,000     378,504,000
Term loan | Significant unobservable Inputs (Level 3)            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term Debt, Fair Value 0   0     0
Assets [Member] | Interest Rate Swap [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities 5,369,000   5,369,000      
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   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 5,369,000   5,369,000      
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   0      
Assets [Member] | Cross Currency Interest Rate Contract [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities (27,537,000)   (27,537,000)     (40,237,000)
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   0     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 (27,537,000)   (27,537,000)     (40,237,000)
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   0     0
Assets [Member] | Interest Rate Swap [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Liabilities           3,961,000
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           3,961,000
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 2,368,000   2,368,000     2,204,000
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   0     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 2,368,000   2,368,000     2,204,000
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   $ 0     $ 0
Measurement Input, Cap Rate [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Goodwill, Fair Value Disclosure         $ 0.111  
Measurement Input, Cap Rate [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Goodwill, Fair Value Disclosure         0.030  
Measurement Input, Long-term Revenue Growth Rate [Member]            
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Goodwill, Fair Value Disclosure         $ 0.0375