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Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 28, 2019
Feb. 23, 2019
Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity   $ 120.0
Credit facility, expiration date   Oct. 17, 2021
Credit facility, remaining borrowing capacity   $ 30.7
Credit facility, outstanding balance   $ 58.0
Credit Facility [Member] | Federal Funds Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   0.50%
Credit Facility [Member] | Eurodollar Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   1.00%
Credit Facility [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity   $ 90.0
Credit Facility [Member] | Reducing Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity   30.0
Credit facility, remaining borrowing capacity   30.0
Credit Facility [Member] | Letter of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility, maximum borrowing capacity   5.0
Credit facility, outstanding balance   $ 1.3
Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Credit facility, commitment fee   0.15%
Credit Facility [Member] | Minimum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   1.25%
Credit Facility [Member] | Minimum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   0.25%
Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Credit facility, commitment fee   0.25%
Credit Facility [Member] | Maximum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   1.50%
Credit Facility [Member] | Maximum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   0.50%
Credit Facility Tranche One [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   1.50%
Credit facility, effective interest rate   4.00%
Credit facility, outstanding balance   $ 19.0
Credit Facility Tranche Two [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   1.50%
Credit facility, effective interest rate   4.10%
Credit facility, outstanding balance   $ 24.0
Credit Facility Tranche Three [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Interest spread on variable rate   1.50%
Credit facility, effective interest rate   4.30%
Credit facility, outstanding balance   $ 15.0
Subsequent Event [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Repayment of Revolving Credit Facility $ 10.0