Share Repurchase Program - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	May 31, 2012	Mar. 31, 2013
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		1,442,738
Treasury stock repurchases, value		25,000,000
Each Fiscal Year
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Treasury stock repurchases		1,141,022
Treasury stock repurchases, value		$ 20,000,000