FAIR VALUE MEASUREMENTS (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2021 USD ($) $ / shares
Designated as Hedging Instrument | Australian Dollar Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, notional amount	$ 61,000	$ 61,000
Contracts weighted average rate price (in dollars per share) | $ / shares		$ 1.29
Deferred gain (loss) from currency translation included in AOCI	(831)	$ (831)
Deferred gain (loss) from currency translation included in AOCI, net of tax	(582)	(582)
Designated as Hedging Instrument | Australian Dollar Forward Contracts | Cost of goods and services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) reclassified for settled contracts	(1,741)	$ (2,399)
Designated as Hedging Instrument | Australian Dollar Forward Contracts | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		30 days
Designated as Hedging Instrument | Australian Dollar Forward Contracts | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		180 days
Not Designated as Hedging Instrument | Canadian Dollar Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, notional amount	$ 7,935	$ 7,935
Derivative, average forward exchange rate	1.30	1.30
Not Designated as Hedging Instrument | Canadian Dollar Forward Contracts | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		29 days
Not Designated as Hedging Instrument | Canadian Dollar Forward Contracts | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		450 days
Not Designated as Hedging Instrument | British Pound Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, notional amount	$ 5,200	$ 5,200
Derivative, average forward exchange rate	0.75	0.75
Not Designated as Hedging Instrument | British Pound Forward Contracts | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		6 days
Not Designated as Hedging Instrument | British Pound Forward Contracts | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		104 days
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Insurance contracts fair value	$ 3,821	$ 3,821
Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument | Canadian Dollar Forward Contracts | Other income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	(520)	244
Realized gains (losses)	(102)	(161)
Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument | British Pound Forward Contracts | Other income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	386	141
Realized gains (losses)	(211)	(281)
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	2,088	2,088
Fair Value, Inputs, Level 2 | Portion at Other than Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	1,000	1,000
Senior notes due 2028 | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior note, fair value disclosure	$ 1,060,000	$ 1,060,000