Stock Repurchase Program (Narrative) (Detail) (USD $)	1 Months Ended	3 Months Ended
	May 31, 2012	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock repurchase program, number of shares authorized to be repurchased	$ 25,000,000
Treasury stock repurchases		618,756
Treasury stock repurchases, value		10,900,000
Each Fiscal Year [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Treasury stock repurchases		317,042
Treasury stock repurchases, value		$ 5,900,000