Summary of significant accounting policies (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands |
12 Months Ended | ||
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Jul. 31, 2015 |
Jul. 31, 2014 |
Jul. 31, 2013 |
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| Allowance for doubtful accounts [Abstract] | |||
| Beginning balance | $ 2,142 | $ 2,707 | |
| Provision for doubtful accounts | 2,284 | 3,063 | $ 4,496 |
| Write-offs | (2,640) | (3,628) | |
| Ending balance | $ 1,786 | $ 2,142 | $ 2,707 |
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- References No definition available.
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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