BACKGROUND AND BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
BACKGROUND AND BASIS OF PRESENTATION [Abstract]
Immaterial error correction		The results of operations for the quarter ended December 31, 2017 and nine months ended June 30, 2018 include a correction to prior period amounts, which we determined to be immaterial to the prior periods to which they relate and are expected to be immaterial to our fiscal 2018 results. The adjustments, relating primarily to accumulated earnings taxes of a foreign operation, increased the income tax expense for the first quarter of fiscal 2018 by $2,071.
Transition tax for accumulated foreign earnings, Income tax expense	$ 2,071	$ 24,641	$ 0

Describes nature and related effect on financial statements related to corrections of prior year errors in the current year financial statements when the effect of the prior year error was immaterial to the prior year financial statements and the current year correction is immaterial to the current year financial statements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 1.M.1)
-URI http://asc.fasb.org/extlink&oid=112272810&loc=d3e30365-122693

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 1.N.Q2)
-URI http://asc.fasb.org/extlink&oid=112272810&loc=d3e30840-122693

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration