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Debt (Details)
€ in Thousands, £ in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Mar. 31, 2017
Mar. 31, 2019
USD ($)
Jun. 30, 2018
Mar. 31, 2018
USD ($)
Feb. 27, 2017
GBP (£)
Feb. 27, 2017
USD ($)
Feb. 27, 2017
EUR (€)
Debt Instrument [Line Items]                
Senior Notes $ 350,000              
Long-term Debt, Current Maturities     $ 0          
Line of Credit Facility, Maximum Borrowing Capacity         $ 1,000,000      
Debt Instrument, Face Amount     884,967   988,190      
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net     (3,619)   (3,395)      
Other Long-term Debt, Noncurrent     33   0      
Line of Credit Facility, Amount Outstanding     301,846   331,206      
Long-term Debt     1,186,846          
Long-term Debt     1,183,227   1,316,001      
Debt Instrument, Interest Rate, Stated Percentage       4.00%        
Long-term Debt, Maturities, Repayments of Principal in Year Two     35,033          
Long-term Debt, Maturities, Repayments of Principal in Year Three     0          
Long-term Debt, Maturities, Repayments of Principal in Year Four     392,846          
Long-term Debt, Maturities, Repayments of Principal after Year Five     $ 758,967          
10 year maturity                
Debt Instrument [Line Items]                
Debt Instrument, Term 10 years 10 years            
12 year maturity                
Debt Instrument [Line Items]                
Debt Instrument, Term 10 years 10 years            
15 year maturity                
Debt Instrument [Line Items]                
Debt Instrument, Term 15 years              
Debt Instrument, Maturity Date, Description   P15Y            
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity         $ 500,000      
United States of America, Dollars                
Debt Instrument [Line Items]                
Senior Notes             $ 95,000  
United Kingdom, Pounds                
Debt Instrument [Line Items]                
Senior Notes | £           £ 75,000    
Euro Member Countries, Euro                
Debt Instrument [Line Items]                
Senior Notes | €               € 99,000