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Financing Arrangements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Oct. 31, 2016
Jul. 31, 2018
Oct. 31, 2018
Oct. 30, 2015
Apr. 29, 2015
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate During Period 5.03% 3.88%          
Letters of Credit Outstanding, Amount $ 5,931            
Collateral Agreement 66.00%            
Long-term Debt $ 236,926            
Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Increase Maximum         $ 150,000   $ 100,000
Line of Credit Facility, Maximum Borrowing Capacity         $ 350,000   360,000
Line of Credit Facility, Remaining Borrowing Capacity 107,469            
Line of Credit Increase Minimum             25,000
Line of Credit, Committed Reductions             $ 30,000
Line of Credit Facility, Increase (Decrease), Net     $ 5,000        
Line of Credit Facility, Current Borrowing Capacity           $ 355,000  
Minimum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage         3.05%    
Maximum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage         3.77%    
Maximum [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Capacity Available for Debt Issuance           40,000  
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases           $ 50,000  
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Long-term Debt 236,600       $ 243,300    
Capital Lease Obligations [Member]              
Debt Instrument [Line Items]              
Long-term Debt $ 2,468       2,640    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 1.50%            
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 3.00%            
Base Rate [Member] | Minimum [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 0.50%            
Base Rate [Member] | Maximum [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate 2.00%            
Tranche B Facility [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity         75,000    
Fixed Rate Debt [Member]              
Debt Instrument [Line Items]              
Long-term Debt         326    
Tranche A Facility [Member] | Lender Group Two [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity         275,000    
Insurance Financing Agreement [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage       2.55%      
Debt Instrument, Periodic Payment       $ 94      
Short-term Debt $ 326       $ 738