Schedule of Basic and Diluted EPS (Detail) (USD $)	3 Months Ended																12 Months Ended
	Jan. 31, 2013		Oct. 31, 2012		Jul. 31, 2012		Apr. 30, 2012		Jan. 31, 2012		Oct. 31, 2011		Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Basic:
Income (loss) from continuing operations																	$ 1.54	$ (0.04)	$ 1.46
Income from discontinued operations																		$ 0.22	$ 0.19
Total basic earnings per share	$ 0.54	[1]	$ 0.33	[1]	$ 0.32	[1]	$ 0.35	[1]	$ (0.49)	[1],[2]	$ (0.27)	[1],[2]	$ 0.51	[1],[2]	$ 0.37	[1],[2]	$ 1.54	$ 0.18	$ 1.65
Diluted:
Income (loss) from continuing operations																	$ 1.54	$ (0.04)	$ 1.45
Income from discontinued operations																		$ 0.22	$ 0.19
Total diluted earnings per share	$ 0.54	[1]	$ 0.33	[1]	$ 0.32	[1]	$ 0.35	[1]	$ (0.49)	[1],[2]	$ (0.27)	[1],[2]	$ 0.50	[1],[2]	$ 0.36	[1],[2]	$ 1.54	$ 0.18	$ 1.64

[1] Earnings per share are computed independently for each of the quarters presented and therefore may not sum to the total for the fiscal year.

[2] Includes loss provisions of $232 million and $308 million recorded in the third quarter and fourth quarter, respectively, in connection with resolution of the CityTime matter described in Note 17.