Debt - Letters of Credit (Details) - Letter of Credit [Member] - USD ($) |
Aug. 01, 2015 |
Jan. 31, 2015 |
|---|---|---|
| Trade LCs [Member] | ||
| Debt Instrument [Line Items] | ||
| Letters of credit outstanding | $ 0 | $ 0 |
| Stand-by LCs [Member] | ||
| Debt Instrument [Line Items] | ||
| Letters of credit outstanding | $ 2,800,000 | $ 2,500,000 |