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Statutory Reserves (Detail) - Subsidiaries [Member] - China [Member]
$ in Millions
3 Months Ended
Jul. 31, 2016
USD ($)
Statutory Reserve [Line Items]  
Percentage of net income required to be transferred to a statutory surplus reserve fund 10.00%
Maximum required percentage of statutory surplus reserve fund to registered capital 50.00%
Statutory surplus reserve fund balance $ 4.8
Percentage of accumulated earnings and profits determined in accordance with PRC accounting rules and regulations 10.00%
Minimum threshold percentage for statutory surplus reserve fund as percentage of registered capital, below which certain capital transactions are prohibited 25.00%