Debt (Details) (USD $)	3 Months Ended			3 Months Ended		3 Months Ended		3 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Feb. 04, 2012	Jul. 30, 2011	Oct. 29, 2011	Feb. 04, 2012 Swap, Receivable [Member]	Jun. 30, 2009 Swap, Receivable [Member]	Feb. 04, 2012 Swap, Payable [Member]	Jun. 30, 2009 Swap, Payable [Member]	Feb. 04, 2012 Term Loan Facility [Member]	Dec. 22, 2010 Term Loan Facility [Member]	Jun. 30, 2009 5.0% Senior unsecured notes due July 1, 2014 [Member]	Feb. 04, 2012 5.0% Senior unsecured notes due July 1, 2014 [Member]	Oct. 29, 2011 5.0% Senior unsecured notes due July 1, 2014 [Member]	Apr. 30, 2011 3.0% Senior unsecured notes due April 15, 2016 [Member]	Feb. 04, 2012 3.0% Senior unsecured notes due April 15, 2016 [Member]
Debt (Textual) [Abstract]
Aggregate principal amount issued for notes									$ 145,000,000	$ 375,000,000	$ 375,000,000	$ 375,000,000	$ 375,000,000
Net proceeds of notes offering										370,400,000			370,500,000
Interest rate to be paid on long term notes										5.00%			3.00%
Maturity date of senior unsecured notes								Dec. 22, 2013			Jul. 01, 2014			Apr. 15, 2016
Term loan facility repayment terms	3-year principle amortization schedule with $3.6 million payable quarterly every March, June, September and December with the balance payable upon the maturity date
Term loan facility principle amortization schedule	3 years
Term loan facility quarterly interest payment	3,600,000
Short-term debt	14,500,000		14,500,000
Semi-annual fixed interest payments											Semi-annual fixed interest payments on January 1 and July 1 of each year commencing January 1, 2010			Semi-annual fixed interest payments on April 15 and October 15 of each year commencing October 15, 2011
Term loan facility, interest rate terms	The loan will bear interest at a fluctuating rate for each period equal to the LIBOR rate corresponding with the tenor of the interest period plus a spread of 1.25% (1.61% as of February 4, 2012).
Debt instrument, interest rate over LIBOR rate	1.25%
Debt, covenant compliance	The Company is compliant with these covenants.							As of February 4, 2012, the Company was compliant with these covenants.			As of February 4, 2012, the Company was compliant with these covenants.
Term loan facility additional principal payment		17,500,000						12,000,000
Derivative [Line Items]
Interest rate to be paid on swap					5.00%
Notional amount of fixed rate debt				375,000,000	375,000,000	375,000,000	375,000,000
Floating interest rate						An annual three-month Libor plus 2.05%
Derivative instrument, interest rate LIBOR period	3 months
Derivative interest rate over LIBOR	2.05%
Number of installments				Paid in two installments on the 1st of every January and July, commencing January 1, 2010 through and ending on the maturity date		Payable in four installments on the 1st of every January, April, July and October, commencing on October 1, 2009 and ending on the maturity date
Interest rate	1.82%					2.63%
Company's principle payments related to its long-term debt obligations in 2012						10,900,000
Company's principle payments related to its long-term debt obligations in 2013						14,500,000
Company's principle payments related to its long-term debt obligations in 2014						450,600,000
Company's principle payments related to its long-term debt obligations in 2016						$ 375,000,000