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Debt Senior Notes (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended 24 Months Ended 48 Months Ended
Mar. 31, 2018
Jul. 31, 2023
Jul. 31, 2022
Jan. 15, 2021
Jan. 14, 2020
Jan. 14, 2019
Jul. 31, 2025
Jul. 31, 2021
Dec. 31, 2017
Debt Instrument [Line Items]                  
Restricted Payments Basket $ 202,000               $ 176,100
2025 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount $ 250,000                
Debt Instrument, Interest Rate, Stated Percentage 5.625%                
Debt Instrument, Redemption Price, Percentage   101.406% 102.813%       100.00% 104.219%  
2021 Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount $ 300,000                
Debt Instrument, Interest Rate, Stated Percentage 6.75%                
Debt Instrument, Redemption Price, Percentage       100.00% 101.688% 103.375%      
2018 Convertible Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Convertible senior subordinated notes $ 86,250                
Debt Instrument, Interest Rate, Stated Percentage 3.00%                
Debt Conversion, Converted Instrument, Amount $ 20,309                
Repayments of Convertible Debt $ 65,941                
Debt Conversion, Converted Instrument, Shares Issued 629                
Debt Instrument, Convertible, Conversion Price $ 32.31                
Base of restricted payments basket income calculation [Member]                  
Debt Instrument [Line Items]                  
Other Restrictions on Payment of Dividends $ 125,000                
Percentage of our aggregate consolidated net income added to base amount of calculation [Member]                  
Debt Instrument [Line Items]                  
Percent restrictions on payment of dividends 50.00%                
Percentage of our aggregate consolidated net income subtracted from base amount of calculation [Member]                  
Debt Instrument [Line Items]                  
Percent restrictions on payment of dividends 100.00%                
Percentage of net cash proceeds from sale of qualified equity interests added to base and income/loss amount in calculation [Member]                  
Debt Instrument [Line Items]                  
Percent restrictions on payment of dividends 100.00%