Share-based Compensation - Restricted Stock and Performance-based Restrcited Stock Activity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Allocated share-based compensation expense		$ 10,454,000	$ 13,177,000	$ 11,412,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Remaining Recognition Period (Years)		1 year 9 months 18 days
Market-based Restricted Stock Units (MSU) [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Allocated share-based compensation expense		$ 600,000	$ 400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted (in shares)	1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Risk-free interest rate	2.70%
Expected term (in years)	3 years 6 months
Volatility rate	38.80%
Dividend yield	0.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested (in shares)	919,023	906,341	919,023	974,365
Granted (in shares)		505,440	527,022	482,397
Vested (in shares)		(455,893)	(499,954)	(468,051)
Forfeited (in shares)		(23,750)	(39,750)	(69,688)
Nonvested (in shares)		932,138	906,341	919,023	974,365
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested (in dollars per share)	$ 15.14	$ 14.09	$ 15.14	$ 13.51
Granted (in dollars per share)		8.51	11.28	16.46
Vested (in dollars per share)		13.53	13.09	13.24
Forfeited (in dollars per share)		13.19	13.82	14.25
Nonvested (in dollars per share)		$ 11.36	$ 14.09	$ 15.14	$ 13.51
Weighted Average Remaining Recognition Period (Years)		1 year 7 months 28 days	1 year 7 months 13 days	1 year 7 months 13 days	1 year 8 months 4 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested		$ 10,141,661	$ 8,465,225	$ 13,086,888	$ 16,244,748
Performance Based Restricted Stock Units (PRSUs) Member [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Allocated share-based compensation expense		$ 1,500,000	$ 2,800,000	$ 1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested (in shares)	422,300	596,724	422,300	170,000
Granted (in shares)		155,000	291,750	298,050
Vested (in shares)		(110,659)	(111,623)	(38,247)
Forfeited (in shares)		(298,290)	(5,703)	(7,503)
Nonvested (in shares)		342,775	596,724	422,300	170,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested (in dollars per share)	$ 16.63	$ 13.95	$ 16.63	$ 17.58
Granted (in dollars per share)		7.36	11.18	16.22
Vested (in dollars per share)		16.68	16.68	17.58
Forfeited (in dollars per share)		11.32	16.78	17.26
Nonvested (in dollars per share)		$ 12.38	$ 13.95	$ 16.63	$ 17.58
Weighted Average Remaining Recognition Period (Years)		1 year 7 months 6 days	1 year 10 months 17 days	2 years 21 days	2 years 2 months 15 days	0 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested		$ 3,729,392	$ 5,573,402	$ 6,013,552	$ 2,833,900
Minimum [Member] | Market-based Restricted Stock Units (MSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Award requisite service period	4 years 6 months
Maximum [Member] | Market-based Restricted Stock Units (MSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Award requisite service period	7 years 6 months