Other Assets (Details) (USD $)	Aug. 31, 2014	Nov. 30, 2013	Jan. 29, 2013 Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]	Aug. 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	$ 70,763,000	$ 68,534,000
Debt issuance costs	28,601,000	27,366,000
Property and equipment, net	10,936,000	8,460,000
Prepaid expenses	7,862,000	2,716,000
Total	118,162,000	107,076,000
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.375%	4.75%
Debt Instrument, Face Amount					$ 400,000,000.0