Supplementary Information (Unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Jul. 03, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Jul. 03, 2020	Jun. 30, 2019	Jun. 30, 2018
Unaudited consolidated quarterly statements of operations data
Net revenues	$ 217,377	$ 208,016	$ 193,913	$ 177,304	$ 176,963	$ 174,636	$ 159,089	$ 144,056		$ 796,610	$ 654,744	$ 493,184
Gross margin	96,613	93,325	88,506	78,400	79,839	73,847	70,887	61,583		356,844	286,156	225,858
Income from operations	26,419	26,342	20,825	17,476	20,851	22,062	19,861	13,810		91,062	76,584	46,985
Income before income taxes	26,990	28,928	20,786	17,229	12,587	19,466	16,866	10,608		93,933	59,527	42,573
Income tax (benefit) provision	(234)	5,363	5,110	(2,018)	(217)	5,357	4,483	3,129		8,221	12,752	1,690
Net income	$ 27,224	$ 23,565	$ 15,676	$ 19,247	$ 12,804	$ 14,109	$ 12,383	$ 7,479		$ 85,712	$ 46,775	$ 40,883
Earnings Per Share [Abstract]
Basic net income per share (in dollars per share)	$ 0.50	$ 0.43	$ 0.29	$ 0.35	$ 0.26	$ 0.30	$ 0.26	$ 0.16		$ 1.57	$ 0.98	$ 0.88
Diluted net income per share (in dollars per share)	$ 0.49	$ 0.43	$ 0.29	$ 0.35	$ 0.25	$ 0.29	$ 0.26		$ 0.16	$ 1.56	$ 0.96	$ 0.86
Cost of revenues										$ 439,766	$ 368,588	$ 267,326