| Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017 | 
|---|---|---|
| Inventories, net [Abstract] | ||
| Raw materials | $ 30,622 | $ 29,396 | 
| Work in process | 64,645 | 61,917 | 
| Finished goods | 84,069 | 80,132 | 
| Inventories | $ 179,336 | $ 171,445 | 
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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://www.xbrl.org/2003/role/presentationRef 
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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://www.xbrl.org/2003/role/presentationRef 
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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://www.xbrl.org/2003/role/presentationRef 
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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://www.xbrl.org/2003/role/presentationRef 
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