Subsequent Events (Details) (USD $) In Billions, unless otherwise specified	1 Months Ended
	Aug. 31, 2012
Subsequent Event [Line Items]
Line of credit agreement period	5
Committed line of credit amount	$ 1.5
Early termination description	(1) a covenant requiring the Company to maintain a debt-to-EBITDA ratio calculated on a consolidated basis of no greater than (a) 3.50 for fiscal quarters ending on April 30, July 31, and October 31 of each year and (b) 3.75 for the fiscal quarter ending on January 31 of each year, (2) a covenant requiring us to maintain an interest coverage (EBITDA-to-interest expense) ratio calculated on a consolidated basis of not less than 2.50 as of the last date of any fiscal quarter, and (3) covenants restricting our ability to incur additional debt, incur liens, merge or consolidate with other companies, sell or dispose of their respective assets (including equity interests), liquidate or dissolve, make investments, loans, advances, guarantees and acquisitions, and engage in certain transactions with affiliates or certain restrictive agreements. In addition, the 2012 CLOC includes provisions which allow us to cure any potential default, including an equity cure.
Minimum [Member]
Subsequent Event [Line Items]
Percentage of annual facility fee	0.125%
Maximum [Member]
Subsequent Event [Line Items]
Percentage of annual facility fee	0.30%
Interest coverage ratio	250.00%
LIBOR [Member] | Minimum [Member]
Subsequent Event [Line Items]
Annual interest rate of facility	0.75%
LIBOR [Member] | Maximum [Member]
Subsequent Event [Line Items]
Annual interest rate of facility	1.45%
PRIME [Member] | Minimum [Member]
Subsequent Event [Line Items]
Annual interest rate of facility	0.00%
PRIME [Member] | Maximum [Member]
Subsequent Event [Line Items]
Annual interest rate of facility	0.45%
Fiscal Quarter Ending April 30, July 31 and October 31 [Member] | Maximum [Member]
Subsequent Event [Line Items]
Threshold of debt to EBITDA ratio	350.00%
Fiscal Quarter Ending On January 31 [Member] | Maximum [Member]
Subsequent Event [Line Items]
Threshold of debt to EBITDA ratio	375.00%