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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Millions		3 Months Ended			9 Months Ended
	Mar. 08, 2016 $ / shares	Apr. 30, 2016 USD ($) $ / shares	Jan. 31, 2016 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2016 $ / shares	Jan. 31, 2015 $ / shares	Feb. 17, 2016 VEF / $	Feb. 16, 2016 VEF / $
Subsequent Event [Line Items]
Diluted (loss) earnings per share			$ (0.30)	$ 0.46	$ 0.48	$ 1.25
Subsequent Event
Subsequent Event [Line Items]
Foreign currency exchange rate, translation \| VEF / $							10.0	6.3
Subsequent Event \| Dividend Declared
Subsequent Event [Line Items]
Dividends payable, declared date	Mar. 08, 2016
Dividends payable, per share amount	$ 0.10
Dividends payable, payable date	Apr. 15, 2016
Dividends declared, record date	Mar. 25, 2016
Free-Floating Exchange Rate \| Subsequent Event
Subsequent Event [Line Items]
Foreign currency exchange rate, translation \| VEF / $							200
Scenario, Forecast \| Minimum
Subsequent Event [Line Items]
Foreign currency devaluation estimated pre-tax charge \| $		$ 9
Diluted (loss) earnings per share		$ (0.11)
Scenario, Forecast \| Maximum
Subsequent Event [Line Items]
Foreign currency devaluation estimated pre-tax charge \| $		$ 12
Diluted (loss) earnings per share		$ (0.14)