Summary of Business and Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning of year	$ (13,980)
Amortization of prior service cost (credit)	1,283	1,548	1,629
Net current period other comprehensive (loss) income	(6,254)	2,006	(658)
Balance as of end of year	(20,234)	(13,980)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning of year	(13,980)	(15,986)
Other comprehensive (loss) income before reclassifications	(7,537)	458
Amortization of prior service cost (credit)	1,283	1,548
Net current period other comprehensive (loss) income	(6,254)	2,006	(658)
Balance as of end of year	$ (20,234)	$ (13,980)	$ (15,986)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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