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Summary of Performance Share Units Activity (Detail) (Performance Share Units, USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested awards outstanding at beginning of year, Shares	2,523,950
Granted, Shares	406,190
Vested, Shares
Forfeited, Shares	(330,530)
Non-vested awards outstanding at end of year, Shares	2,599,610	2,523,950
Non-vested awards outstanding at beginning of year, Weighted average fair value	$ 17.23
Granted, Weighted average fair value	$ 18.22	$ 16.21	$ 24.03
Vested, Weighted average fair value
Forfeited, Weighted average fair value	$ 16.94
Non-vested awards outstanding at end of year, Weighted average fair value	$ 17.42	$ 17.23

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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