Quarterly report pursuant to Section 13 or 15(d)

Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details)

v3.21.2
Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 100.00% 100.00%
United States    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 22.00% 31.00%
Other North America    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 3.00% 6.00%
Total North America    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 25.00% 37.00%
China    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 33.00% 25.00%
Malaysia    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 4.00% 4.00%
Taiwan    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 17.00% 15.00%
Other Asia    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 9.00% 7.00%
Total Asia    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 63.00% 51.00%
Germany    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 4.00% 3.00%
Other Europe    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 8.00% 9.00%
Total Europe    
Revenue, Major Customer [Line Items]    
Concentration risk, percentage 12.00% 12.00%