Basis of Presentation - Additional Information (Detail) $ in Millions |
Jan. 31, 2016
USD ($)
|
|---|---|
| Debt Instrument [Line Items] | |
| Debt instrument percentage | 8.25% |
| 8.25% Senior Notes Due 2019 [Member] | |
| Debt Instrument [Line Items] | |
| Deferred costs | $ 2.0 |
| Base Credit Facility [Member] | |
| Debt Instrument [Line Items] | |
| Deferred costs | $ 0.9 |