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Short-Term Borrowings and Long-Term Debt (Narrative) (Details)
12 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
quarter
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]      
Bank overdraft facility   $ 4,590,000 $ 0
Secured debt, term loan   151,014,000 4,878,000
Debt issuance costs with the credit facility and bonds   2,100,000  
Bank Overdraft Facility [Member]      
Debt Instrument [Line Items]      
Borrowing capacity under credit facility   $ 14,000,000.0  
Debt instrument term   7 days  
Bank overdraft facility   $ 0  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member]      
Debt Instrument [Line Items]      
Borrowing capacity under credit facility $ 350,000,000    
Secured revolving credit facility period 5 years    
Line of credit facility, accordion feature, higher borrowing capacity $ 250,000,000    
Letters of credit available for issuance   0 0
Debt issuance costs $ 1,100,000    
Cash   $ 15,000,000  
Debt instrument, covenant requirement, leverage ratio, EBITDA, number of quarters in measurement period | quarter   4  
Line of credit facility, unused capacity, commitment fee percentage   0.30%  
Percentage of capital stock or other equity interest pledged per credit agreement   65.00%  
Average daily balance on revolving credit facility   $ 296,400,000 269,500,000
Amount available for additional borrowings   $ 149,200,000 156,000,000.0
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Line of credit facility, unused capacity, commitment fee percentage   0.30%  
Line of credit facility, leverage ratio   3.50  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Line of credit facility, unused capacity, commitment fee percentage   0.15%  
Line of credit facility, interest coverage ratio   3.00  
Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Secured revolving credit facility period 5 years    
Secured debt, term loan $ 150,000,000 $ 146,250,000 0
Multi-Currency Revolving Credit Facility, Combined with Accordion Feature [Member]      
Debt Instrument [Line Items]      
Borrowing capacity under credit facility 750,000,000    
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Letters of credit available for issuance $ 50,000,000    
London Interbank Offered Rate (LIBOR) [Member] | Bank Overdraft Facility [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.00%  
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.75%  
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.75%  
London Interbank Offered Rate (LIBOR) [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.00%  
LIBOR Floor Rate [Member] | Bank Overdraft Facility [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.00%  
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.75%  
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.75%  
Alternate Base Rate Loans [Member] | Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.00%  
Mississippi Revenue Bond [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.85%  
Secured debt, term loan   $ 4,764,000 $ 4,878,000
Maximum time period of interest (in years)   10 years  
Debt instrument, exercisable option limitation, period   180 days  
Debt instrument, anniversary, options exercisable, period   5 years  
Debt instrument, redemption price, percentage   100.00%  
Variable interest rate of debt   3.28% 2.855%