Business Segment Data - Schedule of Reports for Net Sales and Operating Income (Loss) by Each Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 1,772,157	$ 1,583,549	$ 3,403,045	$ 3,012,471
Operating income (loss)	159,153	148,757	290,620	264,540
Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales	736,969		1,492,452
Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales	624,421		1,086,174
Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	248,275		494,608
Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales	162,492		329,772
Other [Member]
Segment Reporting Information [Line Items]
Net sales	0		39
Operating Segments [Member] | Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales	736,969	722,461	1,492,452	1,422,577
Operating income (loss)	84,266	76,699	171,485	149,346
Operating Segments [Member] | Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales	625,146	518,964	1,087,429	925,440
Operating income (loss)	83,016	54,776	130,709	103,849
Operating Segments [Member] | Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	248,871	267,358	495,977	521,795
Operating income (loss)	23,952	35,820	49,637	59,085
Operating Segments [Member] | Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales	169,726	73,555	343,426	141,204
Operating income (loss)	4,867	15,010	10,058	20,609
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	0	1,211	39	1,455
Operating income (loss)	(36,948)	(33,548)	(71,269)	(68,349)
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(8,555)	$ 0	(16,278)	$ 0
Eliminations [Member] | Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales	0		0
Eliminations [Member] | Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales	(725)		(1,255)
Eliminations [Member] | Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	(596)		(1,369)
Eliminations [Member] | Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales	(7,234)		(13,654)
Eliminations [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales	$ 0		$ 0