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Goodwill and Intangible Assets - Goodwill Impairment Test (Details)
$ in Thousands
9 Months Ended
Jun. 30, 2018
USD ($)
segment
Goodwill [Line Items]  
Goodwill impairment | $ $ 0
Number of reporting units 5
Number of reporting units for which quantitative assessment was conducted 2
Brooks Semiconductor Solutions Group  
Goodwill [Line Items]  
Number of reporting units 4
Number of reporting units for which qualitative assessment was conducted 3
Brooks Life Sciences  
Goodwill [Line Items]  
Number of reporting units 1