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Credit Facilities (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 30, 2014
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]      
Five-year revolving credit facility $ 430,000    
Additional borrowings under present credit agreement $ 100,000    
Number Of Years Of Bank Credit Agreement 5 years    
Outstanding uncommitted lines of credit   $ 59,133 $ 66,179
Weighted average interest rates on short-term borrowings outstanding   3.10% 2.20%
Prime Rate Or One Month Libor [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Federal funds rate [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Uncommitted lines of credit [Member]      
Debt Instrument [Line Items]      
Outstanding uncommitted lines of credit   $ 59,000 $ 66,000
Unused lines of Credit [Member]      
Debt Instrument [Line Items]      
Outstanding uncommitted lines of credit   $ 248,000  
Five-year term [Member]      
Debt Instrument [Line Items]      
Term loan $ 150,000    
Number Of Years Of Bank Credit Agreement 5 years    
Seven-year term [Member]      
Debt Instrument [Line Items]      
Term loan $ 220,000    
Number Of Years Of Bank Credit Agreement 7 years