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FINANCIAL DERIVATIVES AND HEDGING ACTIVITIES - Outstanding Derivatives Used to Hedge Foreign Exchange Risks (Details) ₱ in Thousands, € in Thousands, ¥ in Thousands, £ in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2023 EUR (€)	Sep. 30, 2023 PHP (₱)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CAD ($)	Sep. 30, 2023 GBP (£)	Sep. 30, 2023 CHF (SFr)	Sep. 30, 2023 CNY (¥)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 PHP (₱)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 CHF (SFr)	Dec. 31, 2022 CNY (¥)
Euro / British Pound | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	€ 0							€ 0
U.S. Dollar / British Pound | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $			$ 14,100							$ 28,600
Euro / U.S. Dollar | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	9,740							9,630
Euro / U.S. Dollar | Not Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	4,500							2,900
British Pound / Euro | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 3,100							£ 2,800
British Pound / Euro | Not Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					2,700							15,950
U.S. Dollar / Swiss Franc | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $			6,970							0
British Pound / Swiss Franc | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					1,930							2,535
Euro / Swiss Franc | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	1,270							0
U.S Dollar / Philippine Peso | Not Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $			7,200							0
Swiss Franc / Euro | Not Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | SFr						SFr 0							SFr 2,250
Swiss Franc / U.S. Dollar | Not Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | SFr						SFr 0							SFr 930
Chinese Yuan / U.S. Dollar | Not Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ¥							¥ 0							¥ 4,400
Cash Flow Hedges | Euro / British Pound | Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	12,679							18,961
Cash Flow Hedges | Philippine Peso / Euro | Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | ₱		₱ 183,120							₱ 0
Cash Flow Hedges | U.S. Dollar / British Pound | Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $			26,817							34,501
Cash Flow Hedges | U.S. Dollar / Euro | Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $			0							824
Cash Flow Hedges | Canadian Dollar / U.S. Dollar | Designated as Hedging | Sell/Buy - sell notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $				$ 0							$ 0
Cash Flow Hedges | Euro / Philippine Peso | Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	1,044,331							1,030,114
Cash Flow Hedges | British Pound / Philippine Peso | Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					765,097							1,144,839
Cash Flow Hedges | Euro / U.S. Dollar | Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | €	€ 93,831							€ 78,435
Cash Flow Hedges | U.S. Dollar / Canadian Dollar | Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | $			$ 31,158							$ 36,423
Cash Flow Hedges | British Pound / U.S. Dollar | Designated as Hedging | Sell/Buy - buy notional
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount | £					£ 8,335							£ 0

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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