Other Non-Current Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 01, 2017	Feb. 24, 2017	Jan. 05, 2017
Swap A [Member]
Derivative, inception date	Jan. 05, 2017
Swap A [Member] | Designated Hedges [Member]
Derivative, notional amount				$ 20,000,000
Swap B [Member]
Derivative, inception date	Feb. 24, 2017
Swap B [Member] | Designated Hedges [Member]
Derivative, notional amount			$ 30,000,000
Swap C [Member]
Derivative, inception date	Jun. 01, 2017
Swap C [Member] | Designated Hedges [Member]
Derivative, notional amount		$ 25,000,000
Swaps A, B and C [Member] | Designated Hedges [Member]
Derivative, notional amount	$ 75,000,000
Swaps A, B and C [Member] | Designated Hedges [Member] | London Interbank Offer Rate ("LIBOR") [Member]
Derivative, average fixed interest rate	1.90%