Quarterly report pursuant to Section 13 or 15(d)

Restricted Stock Activity (Detail)

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Restricted Stock Activity (Detail) - 3 months ended Jul. 31, 2015 - Restricted Stock - $ / shares
shares in Thousands
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Non-vested, beginning of year 1,560
Shares, Granted 579
Shares, Vested (695)
Shares, Forfeited/expired (9)
Shares, Non-vested, end of year 1,435
Weighted-Average Grant Date Fair Value, Non-vested, beginning of year $ 22.15
Weighted-Average Grant Date Fair Value, Granted 25.13
Weighted-Average Grant Date Fair Value, Vested 14.74
Weighted-Average Grant Date Fair Value, Forfeited/expired 23.96
Weighted-Average Grant Date Fair Value, Non-vested, end of year $ 26.93