Stock Compensation Plans and Capital Stock Transactions - Share Repurchase Program (Narrative) (Details) (USD $)	12 Months Ended
	Jan. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares repurchased	600,000.0
Total stock repurchased and held during period, value	$ 10,000,000
Share repurchase program, authorized amount	$ 300,000,000