Earnings Per Share and Shareholders Equity - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended	33 Months Ended
	Mar. 31, 2017	Apr. 01, 2016	Mar. 31, 2017	Apr. 01, 2016	Sep. 30, 2016	Mar. 31, 2017	Jul. 01, 2016	Mar. 31, 2015	Jun. 19, 2014
Earnings Per Share And Shareholders Equity [Line Items]
Anti-dilutive shares excluded from computation of earnings per share	740,575	766,500	775,225	688,600
Preferred stock shares authorized	25,000		25,000			25,000
Preferred stock, par value	$ 100		$ 100			$ 100
Common stock, shares authorized	60,000,000		60,000,000		60,000,000	60,000,000
Common stock, par value	$ 0.20		$ 0.20		$ 0.20	$ 0.20
Preferred stock shares outstanding	0		0		0	0
Approved and authorized amount under the stock repurchase program								$ 400,000,000	$ 200,000,000
Additional approved and authorized amount under the stock repurchase program								$ 200,000,000
Stock repurchased during period, shares			0	202,310	304,577	3,135,927
Aggregate value of repurchased stock						$ 308,500,000
Stock repurchase program, remaining authorized amount available for repurchase in future							$ 91,500,000
Series B Preferred Stock
Earnings Per Share And Shareholders Equity [Line Items]
Preferred stock shares authorized	475,000		475,000			475,000
Preferred stock, par value	$ 1.00		$ 1.00			$ 1.00
Preferred stock shares outstanding	0		0		0	0