Quarterly Financial Data (Unaudited) Text (Details) (USD $)	3 Months Ended		12 Months Ended
	Jan. 31, 2014	Apr. 30, 2013	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Cost Reduction Initiatives Expense		$ 9,379,000
Cost Reduction Initiative Per Share Impact		$ 0.05
Arbitration award expense			480,211,000	0	0
Transaction Gain Related to Arbitration Award	$ 7,489,000
Arbitration Award per share impact	$ 2.27
Diluted	129,283,000		128,867,000	127,934,000	129,083,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,091,000		422,000	869,000	401,000