| Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | 
|---|---|---|
| Inventories, net [Abstract] | ||
| Raw materials | $ 38,220 | $ 35,616 | 
| Work in process | 79,108 | 76,297 | 
| Finished goods | 68,280 | 68,361 | 
| Inventories | $ 185,608 | $ 180,274 | 
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- References No definition available. 
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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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