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BUSINESS COMBINATIONS - Additional Information (Details) - Mainframe2, Inc. - USD ($) $ / shares in Units, $ in Thousands				9 Months Ended
	Sep. 21, 2018	Aug. 24, 2018	Mar. 22, 2018	Apr. 30, 2019
Business Acquisition [Line Items]
Consideration transferred		$ 130,000		$ 130,026
Payments to acquire businesses, gross		$ 26,700
Equity interest issued or issuable (in shares)	2,451,322	1,813,321
Equity interests issued and issuable (in shares)		$ 103,300
Share price (in dollars per share)		$ 56.97
Deferred payment arrangement, amount		$ 43,300
Deferred payment arrangement, amount paid in cash		6,600
Deferred payment arrangement, amount paid in shares		$ 36,700
Deferred payment, number of shares (in shares)		643,746
Payment term		3 years	3 years
Acquisition related costs		$ 1,100		400
Intangible assets				$ 38,180
Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		31,800
Customer relationships
Business Acquisition [Line Items]
Intangible assets		$ 2,200
Estimated life		5 years
Trade Names
Business Acquisition [Line Items]
Intangible assets		$ 4,200
Estimated life		4 years

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