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Other income (expense)	12 Months Ended
Other income (expense)	Jul. 31, 2017
Other Income And Expenses [Abstract]
Other income (expense)	13. Other income (expense) Other income (expense) consists primarily of interest income on cash equivalents and marketable securities, gains on sale of other investments, and foreign exchange gains (losses). In fiscal year 2017, we recorded a $0.6 million interest income in connection with our cash deposits and marketable securities. In fiscal year 2016, we recorded a $3.2 million interest charge in connection with the investigation related to our Danish Subsidiary BK Medical. In fiscal year 2015, we recorded a $0.6 million interest charge in connection with the investigation related to our Danish Subsidiary BK Medical. We had foreign exchange losses totaling $(0.1) million, $(2.7) million, and $(0.4) million during the fiscal years 2017, 2016, and 2015, respectively.