Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock Unit Activity (Detail)

v3.3.1.900
Stockholders' Equity - Summary of Stock Unit Activity (Detail) - Restricted Stock Units Deferred Stock Units and Performance Stock Units [Member] - $ / shares
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested Shares at beginning of period 435,306 446,468 552,980
Awarded Shares 904,344 314,057 146,411
Vested Shares (277,373) (287,485) (205,928)
Forfeited/expired/cancelled Shares (9,232) (37,734) (46,995)
Nonvested Shares at end of period 1,053,045 435,306 446,468
Nonvested Weighted average grant date fair value at beginning of period $ 8.91 $ 9.81 $ 10.51
Awarded Weighted average grant date fair value 6.46 8.60 11.15
Vested Weighted average grant date fair value 6.89 9.83 12.61
Forfeited/expired/cancelled Weighted average grant date fair value 8.42 10.01 9.93
Nonvested Weighted average grant date fair value at ending of period $ 7.34 $ 8.91 $ 9.81