Royalty and other income (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
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Jul. 31, 2018 |
Jul. 31, 2017 |
Jul. 31, 2016 |
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| Royalty and other income (Details) [Line Items] | |||
| Patent Expiration Date | Apr. 24, 2018 | ||
| Revenues | $ 104,713 | $ 107,804 | $ 102,773 |
| Life Sciences [Member] | |||
| Royalty and other income (Details) [Line Items] | |||
| Revenues | 29,936 | 30,397 | 31,858 |
| Royalty and License Fees [Member] | |||
| Royalty and other income (Details) [Line Items] | |||
| Revenues | 712 | 1,205 | 1,521 |
| Royalty and License Fees [Member] | Life Sciences [Member] | |||
| Royalty and other income (Details) [Line Items] | |||
| Revenues | $ 712 | $ 1,205 | $ 1,521 |
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- Definition Patent expiration date. No definition available.
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- References No definition available.
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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