Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Allowance for doubtful accounts and notes receivable [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 25,875	$ 31,192	$ 33,825
Additions Charged to Costs and Expenses	6,016	5,439	7,242
Deductions	6,033	10,756	9,875
Balance at End of Period	25,858	25,875	31,192
Valuation reserve on other investments [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	5,168	4,881	4,820
Additions Charged to Costs and Expenses	109	287	61
Deductions	0	0	0
Balance at End of Period	5,277	5,168	4,881
Valuation allowances for deferred tax assets [Member]
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	55,330	61,744	58,396
Additions Charged to Costs and Expenses	4,025	1,962	8,932
Deductions	6,073	8,376	5,584
Balance at End of Period	$ 53,282	$ 55,330	$ 61,744