Other Assets (Details) (USD $)	May 31, 2014		Nov. 30, 2013		Jan. 29, 2013 Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]	May 31, 2014 Senior Notes [Member] Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member]	Mar. 25, 2014 Senior Notes [Member] Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member]
Other Assets [Abstract]
Cash surrender value of insurance contracts	$ 70,076,000		$ 68,534,000
Debt issuance costs	30,135,000	[1]	27,366,000	[1]
Property and equipment, net	10,450,000		8,460,000
Prepaid expenses	5,897,000		2,716,000
Total	116,558,000		107,076,000
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					1.375%	4.75%	4.75%
Debt Instrument, Face Amount							$ 400,000,000.0

[1] The increase in debt issuance costs as of May 31, 2014 compared to November 30, 2013, primarily reflected the costs associated with our underwritten public issuance of 4.75% senior notes due 2019 (the “4.75% Senior Notes due 2019”) during the second quarter of 2014, as discussed in Note 12. Mortgages and Notes Payable.