Annual report pursuant to Section 13 and 15(d)

Restricted Stock Activity (Detail)

v3.7.0.1
Restricted Stock Activity (Detail) - Restricted Stock - $ / shares
shares in Thousands
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, Non-vested, beginning of year 1,506 1,560 1,880
Shares, Granted 852 784 438
Shares, Vested (751) (809) (705)
Shares, Forfeited/expired (26) (29) (53)
Shares, Non-vested, end of year 1,581 1,506 1,560
Weighted-Average Grant Date Fair Value, Non-vested, beginning of year $ 34.12 $ 22.15 $ 18.95
Weighted-Average Grant Date Fair Value, Granted 17.43 39.19 29.93
Weighted-Average Grant Date Fair Value, Vested 24.15 16.35 18.52
Weighted-Average Grant Date Fair Value, Forfeited/expired 26.80 23.38 21.13
Weighted-Average Grant Date Fair Value, Non-vested, end of year $ 29.74 $ 34.12 $ 22.15