Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Allowance for doubtful accounts and notes receivable [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 31,192	$ 33,825	$ 27,213
Additions Charged to Costs and Expenses	5,439	7,242	12,977
Deductions	10,756	9,875	6,365
Balance at End of Period	25,875	31,192	33,825
Valuation reserve on other investments [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	4,881	4,820	5,952
Additions Charged to Costs and Expenses	287	61	182
Deductions			1,314
Balance at End of Period	5,168	4,881	4,820
Valuation allowances for deferred tax assets [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	61,744	58,396	48,155
Additions Charged to Costs and Expenses	1,962	8,932	13,959
Deductions	8,376	5,584	3,718
Balance at End of Period	$ 55,330	$ 61,744	$ 58,396