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Summary of significant accounting policies (Detail) - Amount of expense related to share-based payment arrangements (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Jul. 31, 2012
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Jul. 31, 2011
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Jul. 31, 2010
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| Share Based Compensation | $ 719 | $ 1,049 | $ 1,170 |
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Cost of Clinical Laboratory Services [Member]
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| Share Based Compensation | 10 | 10 | 12 |
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Research and Development Expense [Member]
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| Share Based Compensation | 4 | 14 | 14 |
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Selling, General and Administrative Expenses [Member]
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| Share Based Compensation | $ 705 | $ 1,025 | $ 1,144 |
| X | ||||||||||
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- Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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