Quarterly report pursuant to Section 13 or 15(d)

Restricted Stock Activity (Detail)

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Restricted Stock Activity (Detail) - Restricted Stock
shares in Thousands
6 Months Ended
Oct. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Non-vested, April 30, 2015 | shares 1,560
Shares, Granted | shares 611
Shares, Vested | shares (778)
Shares, Forfeited/expired | shares (14)
Shares, Non-vested, October 31, 2015 | shares 1,379
Weighted-Average Grant Date Fair Value, Non-vested, April 30, 2015 | $ / shares $ 22.15
Weighted-Average Grant Date Fair Value, Granted | $ / shares 26.97
Weighted-Average Grant Date Fair Value, Vested | $ / shares 16.28
Weighted-Average Grant Date Fair Value, Forfeited/expired | $ / shares 24.42
Weighted-Average Grant Date Fair Value, Non-vested, October 31, 2015 | $ / shares $ 27.57