Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended	8 Months Ended
	Sep. 12, 2017	Sep. 12, 2017	Aug. 23, 2016	Feb. 26, 2016
Common Stock and Warrants [Member]
Class of Stock [Line Items]
Maximum authorized stock repurchase amount (up to)	$ 50,000,000	$ 50,000,000	$ 25,000,000	$ 25,000,000.0
Remaining authorized stock repurchase amount	$ 24,100,000	$ 24,100,000
Common Stock [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)	96,122	737,287
Average price per share	$ 12.35	$ 12.46
Shares repurchased, value	$ 1,200,000	$ 9,200,000
Warrants [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)	1,186	401,186
Average price per share	$ 3.97	$ 3.75
Shares repurchased, value	$ 5,000	$ 1,500,000