Quarterly report pursuant to Section 13 or 15(d)

Stock Options Transactions (Detail)

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Stock Options Transactions (Detail) - Jul. 31, 2015 - Stock Options - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Total
Options  
Outstanding, April 30, 2015 202
Exercised (72)
Forfeited/expired. (5)
Outstanding, July 31, 2015 125
Exercisable, July 31, 2015 125
Weighted Average Exercise Price  
Outstanding, April 30, 2015 $ 15.45
Exercised 15.62
Forfeited/expired. 17.97
Outstanding, July 31, 2015 15.30
Exercisable, July 31, 2015 $ 15.30
Weighted-Average Remaining Contractual Life (In Years)  
Outstanding, July 31, 2015 1 year 8 months 9 days
Exercisable, July 31, 2015 1 year 8 months 9 days
Aggregate Intrinsic Value  
Outstanding, July 31, 2015 $ 2,272
Exercisable, July 31, 2015 $ 2,272