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Guarantees (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015
Guarantor Obligations [Line Items] |  |  |  |
Contingent liability for standby letters of credit, issued and outstanding | $ 7,800,000 |  | $ 7,800,000 |
Amount drawn upon letters of credit | 0 |  | 0 |
Advanced Filtration Systems, Inc. |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Outstanding debt of joint venture | 23,900,000 |  | 23,900,000 |
Joint venture investment earnings (loss) | 200,000 | $ 500,000 | (1,000,000) | $ 1,900,000
Royalty income | $ 1,300,000 | $ 1,500,000 | $ 3,900,000 | $ 4,600,000

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