|
Fair Value Measurements - Changes in Fair Value (Detail) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended | ||||
|---|---|---|---|---|---|
|
Apr. 28, 2012
|
Apr. 30, 2011
|
||||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |||||
| Balance, Level 3 securities, beginning of year | $ 11,220 | $ 8,586 | |||
| Transfers into Level 3 | 2,787 | ||||
| Sales of Level 3 securities | (25) | (25) | |||
| Balance, Level 3 securities, end of quarter | 11,195 | 11,348 | |||
|
Auction-rate securities [Member]
|
|||||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |||||
| Balance, Level 3 securities, beginning of year | 11,220 | 8,586 | |||
| Transfers into Level 3 | 2,787 | [1] | |||
| Sales of Level 3 securities | (25) | (25) | |||
| Balance, Level 3 securities, end of quarter | $ 11,195 | $ 11,348 | |||
|
|||||