DERIVATIVE FINANCIAL INSTRUMENTS - SUMMARY OF INTEREST RATE SWAPS (Details) € in Millions, £ in Millions, gal in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2018 GBP (£) gal	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Interest Rate Swap - April 1, 2019
Derivative [Line Items]
Notional Value			$ 500.0
Interest Rate Swap - October 1, 2020
Derivative [Line Items]
Notional Value			750.0
Interest Rate Swap - July 15, 2021
Derivative [Line Items]
Notional Value			500.0
Interest Rate Swap - March 2025
Derivative [Line Items]
Notional Value				$ 500.0
Hedging of foreign currency risk - June 2019
Derivative [Line Items]
Notional Value			384.0
Hedging of foreign currency risk - June 2021
Derivative [Line Items]
Notional Value			44.0
Hedging of foreign currency risk - June 2021
Derivative [Line Items]
Notional Value			300.0
Hedging of foreign currency risk - July 2021
Derivative [Line Items]
Notional Value			$ 30.0
Hedging of foreign currency risk - July 2021
Derivative [Line Items]
Notional Value | £	£ 234
Hedging of foreign currency risk - August 2021
Derivative [Line Items]
Notional Value | £	£ 466
Hedging of foreign currency risk - June 2023
Derivative [Line Items]
Notional Value | €		€ 500
Hedging of fuel risk
Derivative [Line Items]
Notional amount (in gallons) | gal	46