Immaterial Restatement of Previously Issued Financial Statements and Reclassification - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Apr. 30, 2016 |
Jul. 30, 2016 |
Aug. 01, 2015 |
|
| Error Corrections and Prior Period Adjustments Restatement [Line Items] | |||
| Sales of available-for-sale securities | $ 272,271 | $ 339,837 | $ 301,896 |
| Prepaid expenses and other assets | (15,693) | 9,035 | (11,328) |
| Depreciation and amortization | 27,114 | 53,980 | 51,811 |
| Purchases of property and equipment | (11,868) | $ 24,377 | $ 24,320 |
| Adjustment | |||
| Error Corrections and Prior Period Adjustments Restatement [Line Items] | |||
| Sales of available-for-sale securities | 53,749 | ||
| Prepaid expenses and other assets | (53,749) | ||
| Depreciation and amortization | 5,326 | ||
| Purchases of property and equipment | $ (5,326) | ||