Fair Values of Financial Assets and Hierarchy of Level of Inputs (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Feb. 02, 2013
Partial Payment Received
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of level 3 note receivable	$ 0.5
Unrealized Investment Gain Loss
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of level 3 note receivable	$ 0.1

- Definition

Amount of increase (decrease) of assets measured at fair value on a recurring basis using unobservable inputs (level 3). Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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