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Stock-Based Compensation - Summary of Restricted-Stock Awards and Restricted-Stock Units (Detail)
shares in Thousands
3 Months Ended
Apr. 30, 2016
$ / shares
shares
Time-based Restricted Stock Units [Member]  
Number of Units  
Nonvested units outstanding, beginning balance | shares 463
Granted, Number of Units | shares 169
Vested, Number of Units | shares (131)
Forfeited, Number of Units | shares 0
Nonvested units outstanding, ending balance | shares 501
Weighted- Average Grant Date Fair Value (per unit)  
Weighted-Average Grant Date Fair Value (per unit), beginning balance | $ / shares $ 18.05
Granted, Weighted-Average Grant Date Fair Value (per unit) | $ / shares 19.73
Vested, Weighted-Average Grant Date Fair Value (per unit) | $ / shares 18.58
Forfeited, Weighted-Average Grant Date Fair Value (per unit) | $ / shares 0.00
Weighted-Average Grant Date Fair Value (per unit), ending balance | $ / shares $ 18.48
Performance-based Restricted Stock Units [Member]  
Number of Units  
Nonvested units outstanding, beginning balance | shares 303
Granted, Number of Units | shares 126
Vested, Number of Units | shares 0
Forfeited, Number of Units | shares (46)
Nonvested units outstanding, ending balance | shares 383
Weighted- Average Grant Date Fair Value (per unit)  
Weighted-Average Grant Date Fair Value (per unit), beginning balance | $ / shares $ 20.95
Granted, Weighted-Average Grant Date Fair Value (per unit) | $ / shares 19.76
Vested, Weighted-Average Grant Date Fair Value (per unit) | $ / shares 0.00
Forfeited, Weighted-Average Grant Date Fair Value (per unit) | $ / shares 23.63
Weighted-Average Grant Date Fair Value (per unit), ending balance | $ / shares $ 20.24