Long-Term Debt - Net (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Dec. 10, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Feb. 28, 2019 USD ($)	Jun. 30, 2018 USD ($)
Long-term debt
Debt, gross		$ 822,909	$ 822,909
Total debt, net		778,186	778,186		$ 839,270
Less short-term borrowings and current portion of long-term debt		(66,845)	(66,845)		(66,845)
Total long-term debt, net		711,341	711,341		772,425
Secured net leverage ratio	3.25
Minimum liquidity covenant	$ 75,000
Increase in interest rate margin (as a percent)	0.25%
Consent fee (as a percent)	0.50%
Loss on extinguishment of debt		(413)	(413)
Prior to September 30, 2020
Long-term debt
Secured net leverage ratio	4.25
As of September 30, 2020
Long-term debt
Secured net leverage ratio	4
Term Loan A due 2020
Long-term debt
Debt, gross		198,605	198,605		227,276
Unamortized discount and other debt issuance costs		(7,177)	(7,177)		(10,178)
Total debt, net		$ 191,428	$ 191,428		217,098
Debt instrument, stated percentage		7.50%	7.50%
Term Loan B due 2022
Long-term debt
Debt, gross		$ 624,304	$ 624,304		670,011
Unamortized discount and other debt issuance costs		(37,546)	(37,546)		(47,839)
Total debt, net		$ 586,758	$ 586,758		$ 622,172
Debt instrument, stated percentage		7.87%	7.87%
Term Loans
Long-term debt
Authorized debt repurchase		$ 24,200	$ 24,200	$ 50,000
Term A Loans
Long-term debt
Authorized debt repurchase		8,000	8,000
Term B Loans
Long-term debt
Authorized debt repurchase		$ 16,200	$ 16,200