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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details)
£ in Thousands, $ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Dec. 22, 2020
USD ($)
Dec. 22, 2020
AUD ($)
Nov. 29, 2019
USD ($)
Nov. 29, 2019
GBP (£)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 22, 2020
AUD ($)
Sep. 30, 2020
USD ($)
Business Acquisition [Line Items]                  
Goodwill | $             $ 446,365   $ 442,643
Acquisition costs | $         $ 2,960 $ 2,960      
Quatro Design Pty Ltd                  
Business Acquisition [Line Items]                  
Cash payment to acquire business $ 2,700 $ 3,500              
Additional contingent consideration 760             $ 1,000  
Intangible assets 2,082             2,755  
Goodwill $ 1,246             $ 1,648  
Vatre Group Limited                  
Business Acquisition [Line Items]                  
Intangible assets       £ 3,454          
Goodwill       £ 3,449          
Percentage of outstanding stock acquired       100.00%          
Business combination, consideration transferred     $ 10,500 £ 8,750          
Inventory       2,914          
Accounts receivable and other assets       2,492          
Accounts payable and accrued liabilities       £ 3,765