CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 24, 2021	Dec. 25, 2020	Dec. 24, 2021	Dec. 25, 2020
Income Statement [Abstract]
Revenues	$ 566,633	$ 453,827	$ 1,109,955	$ 890,466
Cost of revenues	(497,262)	(400,806)	(976,987)	(786,965)
Gross profit	69,371	53,021	132,968	103,501
Selling, general and administrative expenses	(17,791)	(17,156)	(38,378)	(34,019)
Expenses related to reduction in workforce	(135)	0	(135)	0
Operating income	51,445	35,865	94,455	69,482
Interest income	295	1,111	1,056	2,215
Interest expense	(238)	(265)	(274)	(516)
Foreign exchange gain (loss), net	(364)	(533)	1,408	(405)
Other income (expense), net	(1,055)	158	(1,315)	279
Income before income taxes	50,083	36,336	95,330	71,055
Income tax expense	(1,204)	(952)	(1,800)	(2,620)
Net income	48,879	35,384	93,530	68,435
Other comprehensive income (loss), net of tax:
Change in net unrealized gain (loss) on available-for-sale securities	(947)	(42)	(1,160)	(367)
Change in net unrealized gain (loss) on derivative instruments	3,294	2,385	2,077	(823)
Change in net retirement benefits plan – prior service cost	126	50	324	223
Change in foreign currency translation adjustment	0	(146)	(164)	457
Total other comprehensive income (loss), net of tax	2,473	2,247	1,077	(510)
Net comprehensive income (loss)	$ 51,352	$ 37,631	$ 94,607	$ 67,925
Earnings per share
Basic (in USD per share)	$ 1.32	$ 0.96	$ 2.53	$ 1.86
Diluted (in USD per share)	$ 1.30	$ 0.94	$ 2.50	$ 1.83
Weighted-average number of ordinary shares outstanding (thousands of shares)
Basic (in shares)	37,017	36,936	36,947	36,877
Diluted (in shares)	37,552	37,551	37,440	37,467