Business Segment Data - Schedule of Report for Net Sales and Operating Income (Loss) by Each Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,947,474	$ 1,772,157	$ 3,706,996	$ 3,403,045
Operating income (loss)	174,014	159,153	324,825	290,620
Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales	769,293	736,969	1,566,394	1,492,452
Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales	764,260	640,573	1,331,952	1,116,110
Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	254,630	248,275	494,370	494,608
Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales	159,291	146,340	314,280	299,836
Other [Member]
Segment Reporting Information [Line Items]
Net sales				39
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	1,947,474	1,772,157	3,706,996	3,403,045
Operating Segments [Member] | Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales	769,299	736,969	1,566,416	1,492,452
Operating income (loss)	76,958	84,266	171,876	171,485
Operating Segments [Member] | Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales	765,022	641,309	1,333,404	1,117,380
Operating income (loss)	125,798	83,018	204,480	130,271
Operating Segments [Member] | Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	255,650	248,871	495,873	495,977
Operating income (loss)	10,228	23,952	21,910	49,637
Operating Segments [Member] | Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales	173,308	153,540	339,979	313,453
Operating income (loss)	19,629	4,865	21,192	10,496
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales				39
Operating income (loss)	(58,599)	(36,948)	(94,633)	(71,269)
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(15,805)	(8,532)	(28,676)	(16,256)
Eliminations [Member] | Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales	(6)		(22)
Eliminations [Member] | Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales	(762)	(736)	(1,452)	(1,270)
Eliminations [Member] | Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	(1,020)	(596)	(1,503)	(1,369)
Eliminations [Member] | Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales	$ (14,017)	$ (7,200)	$ (25,699)	$ (13,617)