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Summary of Changes in Unrecognized Income Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Income Tax Contingency [Line Items]    
Beginning balance $ 6.0 $ 8.1
Increases based on tax positions related to current year 1.8 0.7
Increases for tax positions of prior years 0.2 0.1
Decreases for tax positions of prior years   (0.3)
Decreases due to settlements with taxing authorities 0.0 0.0
Decreases due to lapse of applicable statute of limitations (0.4) (2.6)
Adjustments due to foreign exchange rate 0.0 0.0
Ending balance 7.6 6.0
Net interest as of end of fiscal year $ 0.4 $ 0.3