Common Stock Repurchases (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended
Feb. 28, 2019	Feb. 28, 2018	Sep. 30, 2017
Common Stock Repurchases [Abstract]
Common stock repurchased and retired (in shares)	0.7	1.1
Common stock repurchased and retired	$ 25,000	$ 45,000
Authorized amount for share repurchase programs			$ 250,000
Remaining authorized repurchase amount	$ 75,000

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration