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Note 10 - Long-Term Debt (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2015
USD ($)
Nov. 30, 2015
USD ($)
Nov. 30, 2014
USD ($)
May. 31, 2015
USD ($)
May. 31, 2014
USD ($)
Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   3.75%      
Term Loan Facility [Member] | Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate   2.75%      
Term Loan Facility [Member]          
Debt Instrument, Interest Rate, Stated Percentage 5.00% 5.00%   5.00%  
Debt Instrument, Interest Rate, Effective Percentage 6.10% 6.10%      
Debt Instrument Pricipal Payment Percent 0.25%        
Long-term Debt, Current Maturities $ 1,700,000 $ 1,700,000      
Original Term Loan Facility [Member]          
Secured Long-term Debt, Noncurrent $ 663,300,000 $ 663,300,000      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   3.75%      
Revolving Credit Facility [Member] | Base Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate   2.75%      
Revolving Credit Facility [Member] | Weighted Average [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.40% 4.40%      
Revolving Credit Facility [Member]          
Long-term Line of Credit $ 0 $ 0      
Line of Credit Facility, Maximum Borrowing Capacity 100,000,000 $ 100,000,000      
Line of Credit Facility Step Down Rate   0.25%      
Line Of Credit Facility Net Leverage Ratio   3      
Repayments of Lines of Credit   $ 28,000,000      
Letter of Credit [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000 $ 25,000,000      
Senior Credit Facilities [Member] | Federal Funds Effective Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate   0.50%      
Senior Credit Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   1.00%      
Minimum [Member]          
Line of Credit Facility, Interest Rate at Period End 1.25% 1.25%      
Notes Payable, Other Payables [Member]          
Debt Instrument, Interest Rate, Stated Percentage 11.125% 11.125%      
Debt Instrument, Face Amount $ 400,000,000 $ 400,000,000      
Letters of Credit Outstanding, Amount $ 0 $ 0      
Line Of Credit Facility Provisions       $ 0 $ 0
Debt Instrument, Interest Rate, Effective Percentage 11.70% 11.70%      
Repayments of Lines of Credit   $ 28,000,000 $ 29,500,000    
Long-term Debt, Current Maturities $ 4,404,000 $ 4,404,000   $ 4,469,000