Investments and Fair Value Measurements (Fair Value Inputs) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Aug. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Student loan ARS		$ 2,108
Domestic equity funds	6,502	7,127
International equity funds	762	742
Fixed income funds	257	287
Total assets at fair value	7,521	10,264
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Student loan ARS		0
Domestic equity funds	6,502	7,127
International equity funds	762	742
Fixed income funds	257	287
Total assets at fair value	7,521	8,156
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Student loan ARS		0
Domestic equity funds	0	0
International equity funds	0	0
Fixed income funds	0	0
Total assets at fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Student loan ARS		2,108
Domestic equity funds	0	0
International equity funds	0	0
Fixed income funds	0	0
Total assets at fair value	$ 0	$ 2,108