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ACQUISITIONS - Acquisitions (Details)
£ in Thousands, $ in Thousands, $ in Thousands
12 Months Ended
Dec. 22, 2020
USD ($)
Dec. 22, 2020
AUD ($)
Nov. 29, 2019
USD ($)
Nov. 29, 2019
GBP (£)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2021
USD ($)
Dec. 22, 2020
AUD ($)
Business Acquisition [Line Items]                
Goodwill | $         $ 424,098 $ 418,522 $ 426,148  
Acquisition related costs | $         $ 2,960 $ 0    
Quatro Design Pty Ltd                
Business Acquisition [Line Items]                
Cash payment to acquire business $ 2,700 $ 3,500            
Additional contingent consideration 760             $ 1,000
Goodwill 784             1,038
Intangible assets, other than goodwill acquired $ 2,082             $ 2,755
Vatre Group Limited                
Business Acquisition [Line Items]                
Goodwill       £ 3,449        
Intangible assets, other than goodwill acquired       £ 3,454        
Business acquisition, percentage of voting interests acquired       100.00%        
Business combination, consideration transferred     $ 10,500 £ 8,750        
Inventories       2,914        
Accounts receivable       2,492        
Accounts payable and other accrued liabilities       £ 3,765