CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect of adoption of share-based compensation accounting guidance	$ 836		$ 232	$ 604
Adjusted opening balances after adoption of share-based compensation accounting guidance	390,376	$ 9,828	85,036	324,379	$ (28,867)
Beginning balance (in shares) at Jul. 02, 2016		19,661
Beginning balance at Jul. 02, 2016	389,540	$ 9,828	84,804	323,775	(28,867)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	27,793			19,312	8,481
Proceeds from issuance of common stock under stock option plans (in shares)		93
Proceeds from issuance of common stock under stock option plans	1,028	$ 47	981
Share-based compensation	3,357		3,357
Shares withheld for taxes under equity compensation plans (in shares)		(19)
Shares withheld for taxes under equity compensation plans	(1,860)	$ (10)	(1,850)
Cash dividends declared ($0.78 per share)	(15,385)			(15,385)
Ending balance (in shares) at Dec. 31, 2016		19,735
Ending balance at Dec. 31, 2016	$ 405,309	$ 9,865	$ 87,524	$ 328,306	$ (20,386)