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RESTRUCTURING CHARGES - Summary of the restructuring and other related charges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |
Charges | $ 21,418 | $ 13,669
Personnel Related Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Charges | 3,190 | 5,620
Facilities, Exit Costs and Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Charges | 11,573 | 3,357
Non-cash facility and other |  |
Restructuring Cost and Reserve [Line Items] |  |
Charges | 6,655 | 4,692
Cost of Sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Charges | 7,923 | 4,159
Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Charges | $ 13,495 | $ 9,510

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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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