Consolidating Financial Information Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Revenue	$ 832,330	$ 845,739	$ 2,409,443	$ 2,308,153
Cost of goods sold	493,967	508,812	1,480,833	1,413,827
Gross profit	338,363	336,927	928,610	894,326
Research and development	109,985	106,411	337,636	334,308
Selling, general and administrative	125,604	126,555	401,041	404,853
Other operating expense (Note 9)	21,617	23,641	37,514	53,110
Total operating expenses	257,206	256,607	776,191	792,271
Income (loss) from operations	81,157	80,320	152,419	102,055
Interest expense	(9,562)	(16,338)	(33,604)	(43,387)
Interest income	2,814	2,215	7,788	4,039
Other expense (income)	(3,520)	(757)	(85,007)	(1,883)
Income before income taxes	70,889	65,440	41,596	60,824
Income tax (expense) benefit (Note 11)	(1,372)	(98,522)	30,012	(88,611)
Income in subsidiaries	0	0	0	0
Net income (loss)	69,517	(33,082)	71,608	(27,787)
Comprehensive income (loss)	68,455	(32,185)	68,290	(26,563)
Parent Company
Revenue	0	0	0	0
Cost of goods sold	0	0	0	0
Gross profit	0	0	0	0
Research and development	8,122	7,101	21,433	20,600
Selling, general and administrative	10,327	6,381	36,998	37,252
Other operating expense (Note 9)	173	234	442	448
Total operating expenses	18,622	13,716	58,873	58,300
Income (loss) from operations	(18,622)	(13,716)	(58,873)	(58,300)
Interest expense	(9,235)	(16,001)	(32,677)	(42,367)
Interest income	0	0	0	0
Other expense (income)	(1,852)	0	(84,004)	0
Income before income taxes	(29,709)	(29,717)	(175,554)	(100,667)
Income tax (expense) benefit (Note 11)	6,147	(30,116)	43,521	5,657
Income in subsidiaries	93,079	26,751	203,641	67,223
Net income (loss)	69,517	(33,082)	71,608	(27,787)
Comprehensive income (loss)	68,455	(32,185)	68,290	(26,563)
Guarantor Subsidiaries
Revenue	271,671	301,077	740,241	829,625
Cost of goods sold	225,156	212,574	622,688	592,928
Gross profit	46,515	88,503	117,553	236,697
Research and development	10,218	6,842	20,837	34,728
Selling, general and administrative	53,131	57,166	170,011	190,336
Other operating expense (Note 9)	21,477	15,799	27,225	39,659
Total operating expenses	84,826	79,807	218,073	264,723
Income (loss) from operations	(38,311)	8,696	(100,520)	(28,026)
Interest expense	(516)	(557)	(1,575)	(1,689)
Interest income	269	614	3,152	1,439
Other expense (income)	(2,566)	(549)	(1,440)	207
Income before income taxes	(41,124)	8,204	(100,383)	(28,069)
Income tax (expense) benefit (Note 11)	(23,051)	(59,974)	(26,717)	(76,149)
Income in subsidiaries	157,371	78,522	329,578	171,024
Net income (loss)	93,196	26,752	202,478	66,806
Comprehensive income (loss)	92,520	28,630	201,891	68,783
Non-Guarantor Subsidiaries
Revenue	762,484	751,995	2,214,289	2,108,231
Cost of goods sold	447,084	473,330	1,333,037	1,346,505
Gross profit	315,400	278,665	881,252	761,726
Research and development	94,114	97,842	300,233	292,926
Selling, general and administrative	82,581	88,016	260,359	268,072
Other operating expense (Note 9)	499	7,466	10,011	12,764
Total operating expenses	177,194	193,324	570,603	573,762
Income (loss) from operations	138,206	85,341	310,649	187,964
Interest expense	(206)	(393)	(527)	(1,161)
Interest income	2,941	2,214	5,811	4,430
Other expense (income)	898	(208)	437	(2,090)
Income before income taxes	141,839	86,954	316,370	189,143
Income tax (expense) benefit (Note 11)	15,532	(8,432)	13,208	(18,119)
Income in subsidiaries	0	0	0	0
Net income (loss)	157,371	78,522	329,578	171,024
Comprehensive income (loss)	156,974	82,312	326,701	172,528
Eliminations and Reclassifications
Revenue	(201,825)	(207,333)	(545,087)	(629,703)
Cost of goods sold	(178,273)	(177,092)	(474,892)	(525,606)
Gross profit	(23,552)	(30,241)	(70,195)	(104,097)
Research and development	(2,469)	(5,374)	(4,867)	(13,946)
Selling, general and administrative	(20,435)	(25,008)	(66,327)	(90,807)
Other operating expense (Note 9)	(532)	142	(164)	239
Total operating expenses	(23,436)	(30,240)	(71,358)	(104,514)
Income (loss) from operations	(116)	(1)	1,163	417
Interest expense	395	613	1,175	1,830
Interest income	(396)	(613)	(1,175)	(1,830)
Other expense (income)	0	0	0	0
Income before income taxes	(117)	(1)	1,163	417
Income tax (expense) benefit (Note 11)	0	0	0	0
Income in subsidiaries	(250,450)	(105,273)	(533,219)	(238,247)
Net income (loss)	(250,567)	(105,274)	(532,056)	(237,830)
Comprehensive income (loss)	$ (249,494)	$ (110,942)	$ (528,592)	$ (241,311)