Stockholders' Equity (Details) - USD ($) |
Aug. 01, 2015 |
Jan. 31, 2015 |
Jun. 12, 2014 |
May. 28, 2014 |
|---|---|---|---|---|
| Class of Warrant or Right [Line Items] | ||||
| Amount authorized under share repurchase program | $ 100,000,000 | |||
| Preferred stock, par value (usd per share) | $ 0.01 | $ 0.01 | ||
| Stockholder Rights Plan [Member] | ||||
| Class of Warrant or Right [Line Items] | ||||
| Percent of outstanding stock acquired | 10.00% | |||
| Number of securities called by each warrant | 0.01 | |||
| Exercise price | $ 70.00 |