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SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended
	Feb. 08, 2019	Jan. 17, 2019	Feb. 08, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Repurchase Agreement Counterparty [Line Items]
Value of total number of shares purchased				$ 206,315	$ 112,764			$ 34,493	$ 116,761
Common Stock
Repurchase Agreement Counterparty [Line Items]
Stock repurchased and retired (in shares)				2,287,975	1,238,163	586,924	757,219	602,192	2,148,832
Common stock repurchased, average price per share (in usd per share)				$ 90.17	$ 91.07	$ 70.11	$ 69.48
Value of total number of shares purchased				$ 2	$ 1	$ 41,100	$ 52,600		$ 2
Common Stock | November Repurchase Program
Repurchase Agreement Counterparty [Line Items]
Remaining authorization at the end of the period				$ 187,200
Subsequent event
Repurchase Agreement Counterparty [Line Items]
Dividends declared per share (in usd per share)	$ 0.25
Subsequent event | Synopsys Inc.
Repurchase Agreement Counterparty [Line Items]
Litigation settlement, amount awarded to other party		$ 18,000
Subsequent event | Common Stock
Repurchase Agreement Counterparty [Line Items]
Stock repurchased and retired (in shares)			91,249
Common stock repurchased, average price per share (in usd per share)			$ 98.63
Value of total number of shares purchased			$ 9,000
Subsequent event | Common Stock | November Repurchase Program
Repurchase Agreement Counterparty [Line Items]
Remaining authorization at the end of the period	$ 178,200		$ 178,200

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