Debt Long Term Debt Table (Details) (USD $)	Jan. 31, 2014		Jan. 31, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 751,154,000		$ 765,238,000
2008 9.05% Series A, due December 2015 [Member]
Debt Instrument [Line Items]
Long-term Debt	103,804,000	[1],[2]	105,598,000	[1],[2]
2009 10.00% Series A, due April 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt	50,000,000	[1]	50,000,000	[1]
2009 10.00% Series A, due February 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt	125,000,000	[1]	125,000,000	[1]
2009 10.00% Series B, due February 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt	125,000,000	[1]	125,000,000	[1]
2010 1.72% Notes, due September 2016 [Member]
Debt Instrument [Line Items]
Long-term Debt	97,350,000	[1],[3]	109,640,000	[1],[3]
2012 4.40% Series B Notes, due July 2042 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 250,000,000	[4]	$ 250,000,000	[4]

[1] The agreements require lump sum repayments upon maturity

[2] These Notes were issued, at par, $100,000,000. In 2009, the Company entered into an interest rate swap to effectively convert this fixed rate obligation to a floating rate obligation. The Company terminated the interest rate swap in 2011 and is amortizing the remaining gain on the swap until the debt maturity.

[3] These Notes were issued, at par, ¥10,000,000,000

[4] The agreement requires repayments of $50,000,000 every five years beginning in 2022.