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Short-term Debt - Bank of America (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) | Jun. 30, 2016 USD ($) building | Jun. 30, 2018 USD ($) | Jun. 30, 2016 USD ($) building | Oct. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Oct. 31, 2018 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |
Total short-term debt |  |  | $ 116,181,000 |  |  | $ 22,660,000 |
Line of credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Total short-term debt |  |  | $ 93,246,000 |  |  | $ 0 |
Bank of America | Bank of America 2016 Amended Credit Agreement | Line of credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 85,000,000.0 |  | $ 85,000,000.0 |  |  |
Credit facility, basis spread on variable rate |  | 1.25% |  |  |  |  |
Bank of America | Bank of America 2016 Credit Agreement | Term loan | Secured debt |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, term |  | 5 years |  |  |  |  |
Debt, face amount |  | $ 50,000,000 |  | $ 50,000,000 |  |  |
Number of buildings as collateral | building |  | 7 |  | 7 |  |  |
Bank of America | Bank of America 2016 Credit Agreement | Term loan | Secured debt | LIBOR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate |  | 1.25% |  |  |  |  |
Bank of America | Bank of America 2016 Credit Agreement | Line of credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 5,000,000 |  | $ 5,000,000 |  |  |
Bank of America | Bank of America loan and security agreement |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 4.75% |  |  | 5.25% |
Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 5,000,000 |  |  |  |  |  | $ 3,200,000
Credit facility, term | 5 years |  |  |  |  |  |
Expiration period | 364 days |  |  |  |  |  |
Commitment fee amount |  |  | $ 3,200,000 |  |  |  |
Debt issuance costs |  |  | $ 2,800,000 |  |  | $ 700,000 |
Credit facility, remaining borrowing capacity |  |  |  |  |  | $ 246,800,000 |
Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |
Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate | 2.75% |  |  |  |  |  |
Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility | LIBOR | Minimum | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate | 1.50% |  |  |  |  |  |
Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility | LIBOR | Maximum | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate | 2.00% |  |  |  |  |  |
Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility And Other Financial Accommodations |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 250,000,000 |  |  |  |  |  |
Taiwan And Netherlands | Bank of America | Bank of America 2016 Amended Credit Agreement | Line of credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 20,000,000 |  | $ 20,000,000 |  |  |
Taiwan And Netherlands | Bank of America | Bank of America 2016 Amended Credit Agreement | Line of credit | Revolving Credit Facility | Minimum |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, basis spread on variable rate |  |  |  | 0.90% |  |  |
Subsequent event | Bank of America | Bank of America loan and security agreement | Line of credit | Revolving Credit Facility |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | $ 15,000,000 |  |

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