Stock and Savings Plans (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2014
Exercise price range [Line Items]
Outstanding options	3,504
Exercisable options	2,186
Exercise price 1 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 16.75
Option exercise price range (high)	$ 16.75
Outstanding options	600
Outstanding options weighted average contractual life remaining	2 years 6 months 11 days
Outstanding options weighted average exercise price	$ 16.75
Exercisable options	360
Exercisable options weighted average exercise price	$ 16.75
Exercise price 2 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 19.62
Option exercise price range (high)	$ 25.79
Outstanding options	361
Outstanding options weighted average contractual life remaining	4 years 10 months 28 days
Outstanding options weighted average exercise price	$ 20.54
Exercisable options	81
Exercisable options weighted average exercise price	$ 20.11
Exercise price 3 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 26.74
Option exercise price range (high)	$ 26.74
Outstanding options	682
Outstanding options weighted average contractual life remaining	5 years 11 months 12 days
Outstanding options weighted average exercise price	$ 26.74
Exercisable options	0
Exercisable options weighted average exercise price	$ 0.00
Exercise price 4 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 33.12
Option exercise price range (high)	$ 42.27
Outstanding options	778
Outstanding options weighted average contractual life remaining	2 years 3 months 7 days
Outstanding options weighted average exercise price	$ 40.29
Exercisable options	699
Exercisable options weighted average exercise price	$ 40.57
Exercise price 5 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 42.41
Option exercise price range (high)	$ 63.79
Outstanding options	613
Outstanding options weighted average contractual life remaining	1 year 10 months 13 days
Outstanding options weighted average exercise price	$ 53.10
Exercisable options	576
Exercisable options weighted average exercise price	$ 53.46
Exercise price 6 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 65.26
Option exercise price range (high)	$ 91.20
Outstanding options	468
Outstanding options weighted average contractual life remaining	1 year 0 months 4 days
Outstanding options weighted average exercise price	$ 70.08
Exercisable options	468
Exercisable options weighted average exercise price	$ 70.08
Exercise price 7 [Member]
Exercise price range [Line Items]
Option exercise price range (low)	$ 169.47
Option exercise price range (high)	$ 169.47
Outstanding options	2
Outstanding options weighted average contractual life remaining	7 months 28 days
Outstanding options weighted average exercise price	$ 169.47
Exercisable options	2
Exercisable options weighted average exercise price	$ 169.47