Note 7 - Debt (Details Textual) | Jun. 15, 2019USD ($) | Jun. 14, 2019 | May 08, 2019USD ($) | Apr. 12, 2019USD ($) | Jan. 08, 2019 | Jan. 07, 2019 | May 01, 2017USD ($) | Jun. 30, 2015USD ($) | Jun. 30, 2019USD ($) | Jun. 30, 2018USD ($) | Jun. 30, 2019USD ($) | Jun. 30, 2018USD ($) | Apr. 22, 2018 | Jun. 30, 2020 | Dec. 31, 2018USD ($) | Jun. 17, 2015USD ($) |
Repayments of Long-term Debt, Total | | | | | | | | | | | $ 691,180,000 | $ 5,633,000 | | | | |
Write off of Deferred Debt Issuance Cost | | | | | | | | | | | 4,207,000 | 110,000 | | | | |
Payments of Debt Issuance Costs | | | | | | | | | | | 11,671,000 | 2,131,000 | | | | |
Amortization of Debt Issuance Costs | | | | | | | | | $ 1,300,000 | $ 1,000,000 | 2,409,000 | $ 2,012,000 | | | | |
Debt Issuance Costs, Net, Total Reductions to Debt and Other, Noncurrent | | | | | | | | | 22,600,000 | | 22,600,000 | | | | $ 17,600,000 | |
Debt Issuance Costs, Net, Total | | | | | | | | | 19,925,000 | | 19,925,000 | | | | 17,570,000 | |
Other Noncurrent Assets [Member] | | | | | | | | | | | | | | | | |
Debt Issuance Costs, Net, Total | | | | | | | | | $ 2,700,000 | | 2,700,000 | | | | $ 0 | |
Secured Debt [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | $ 750,000,000 | | | | | | | | | |
Optional Additional Available Credit Facilities | | | | | | | $ 600,000,000 | | | | | | | | | |
Debt Instrument, Covenant, Maximum First Lien Net Leverage Ratio | | | | | | | 3 | | | | | | | | | |
Payments of Debt Issuance Costs | | | | | | | | | | | 12,400,000 | | | | | |
Deferred Finance Costs, Capitalized | | | | | | | | | | | $ 11,700,000 | | | | | |
Secured Debt [Member] | Minimum [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | | | | | 3.91% | | 3.91% | | | | | |
Secured Debt [Member] | Maximum [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Effective Percentage | | | | | | | | | 4.41% | | 4.41% | | | | | |
Secured Debt [Member] | Incremental Term Loan A [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | $ 250,000,000 | | | | | | | | | |
Debt Instrument, Term | | | | | | | 5 years | | | | | | | | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | $ 500,000,000 | | | | | | | | | |
Debt Instrument, Term | | | | | 7 years | | 7 years | | | | | | | | | |
Long-term Debt, Gross | | | | | | | | | $ 490,000,000 | | $ 490,000,000 | | | | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | | | | | 2.25% | | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | | | | | | 1.75% | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | Base Rate [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | | | | | 1.25% | | | |
Secured Debt [Member] | Incremental Term Loan B [Member] | Base Rate [Member] | Forecast [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | | | | | | 0.75% | | |
Secured Debt [Member] | Term B-2 Loan [Member] | | | | | | | | | | | | | | | | |
Long-term Debt, Gross | | | | | | | | | 249,400,000 | | 249,400,000 | | | | | |
Secured Debt [Member] | Term B-3 Loan [Member] | | | | | | | | | | | | | | | | |
Long-term Debt, Gross | | | | | | | | | 325,000,000 | | 325,000,000 | | | | | |
Secured Debt [Member] | Term B-3 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 2.00% | | | | | | | | | | | | |
Secured Debt [Member] | Term B-3 Loan [Member] | Base Rate [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 1.00% | | | | | | | | | | | | |
Secured Debt [Member] | New Term Loan A [ Member] | | | | | | | | | | | | | | | | |
Long-term Debt, Gross | | | | | | | | | 250,000,000 | | 250,000,000 | | | | | |
Secured Debt [Member] | New Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | 1.25% | | | | | | | | | | | | | |
Secured Debt [Member] | New Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | 1.75% | | | | | | | | | | | | | |
Secured Debt [Member] | New Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | 0.25% | | | | | | | | | | | | | |
Secured Debt [Member] | New Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | 0.75% | | | | | | | | | | | | | |
Secured Debt [Member] | JPMorgan Chase Bank [Member] | New Term Loan A [ Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | $ 250,000,000 | | | | | | | | | | | | | |
Debt Instrument, Percentage of Original Principal Amount, Amortized, Next Twelve Month | | | 2.50% | | | | | | | | | | | | | |
Debt Instrument, Percentage of Original Principal Amount, Amortized, Year Two | | | 2.50% | | | | | | | | | | | | | |
Debt Instrument, Percentage of Original Principal Amount, Amortized, Year Three | | | 5.00% | | | | | | | | | | | | | |
Debt Instrument, Percentage of Original Principal Amount, Amortized, Year Four | | | 7.50% | | | | | | | | | | | | | |
Debt Instrument, Percentage of Original Principal Amount, Amortized, Year Five | | | 12.50% | | | | | | | | | | | | | |
Secured Debt [Member] | JPMorgan Chase Bank [Member] | Delayed Draw Term Loan A [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | $ 450,000,000 | | | | | | | | | | | | | |
Debt Instrument, Unused Borrowing Capacity, Fee Percentage | | | 0.30% | | | | | | | | | | | | | |
Secured Debt [Member] | JPMorgan Chase Bank [Member] | New Revolving Credit Facility [Member] | | | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | $ 350,000,000 | | | | | | | | | | | | | |
Secured Debt [Member] | CoBank, ACB [Member] | Term B-2 Loan [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Term | | | | | | 7 years | | | | | | | | | | |
Secured Debt [Member] | CoBank, ACB [Member] | Term B-3 Loan [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 325,000,000 | | | | | | | | | | | | |
Debt Instrument, Amortization Percent on a Annual Basis | | | | 1.00% | | | | | | | | | | | | |
Secured Debt [Member] | CoBank, ACB [Member] | Term B-3 Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | 2.00% | | | | | | | | | | | | | | |
Secured Debt [Member] | CoBank, ACB [Member] | Term B-3 Loan [Member] | Base Rate [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 1.00% | | | | | | | | | | | | |
Senior Unsecured Notes Due 2022 [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | $ 450,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | 5.75% |
Repayments of Long-term Debt, Total | $ 450,000,000 | | | | | | | | | | | | | | | |
Debt Instrument, Prepayment Penalty | 6,500,000 | | | | | | | | | | | | | | | |
Write off of Deferred Debt Issuance Cost | $ 3,800,000 | | | | | | | | | | | | | | | |
Senior Credit Facilities Due 2020 [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member] | | | | | | | | | | | | | | | | |
Debt Instrument, Term | | | | | | | | 5 years | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | $ 200,000,000 | | | | | | | | |
Senior Credit Facilities Due 2020 [Member] | Line of Credit [Member] | JPMorgan Chase Bank [Member] | | | | | | | | | | | | | | | | |
Letters of Credit Outstanding, Amount | | | | | | | | | 5,500,000 | | 5,500,000 | | | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | | | | | | $ 344,500,000 | | $ 344,500,000 | | | | | |