Stock-Based Compensation - Summary of Grants of Performance Based Restricted Stock Units Associated with Non-Employee (Detail) - Performance Based Restricted Stock Units [Member] - Non-employee [Member] - $ / shares		Jul. 13, 2017	Jul. 14, 2016	Jul. 15, 2015	Apr. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Awarded	[1]	10,200	11,549	10,364
Vesting Period		3 years	3 years	3 years
Granted on July 13, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price Per Share	[2]				$ 30.10
Granted on July 14, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price Per Share	[2]				30.10
Granted on July 15, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Price Per Share	[2]				$ 30.10

[1] Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.

[2] The respective grant was unvested at the end of our reporting period. Accordingly, the price per share represents the closing price of our common stock on April 29, 2018, the end of our reporting period.