Business Segment Data - Schedule of Reports for Net Sales, Operating Income (Loss), Assets, Goodwill, Capital Expenditures and Depreciation and Amortization by Each Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 1,880,549	$ 1,628,082	$ 1,772,157	$ 1,630,888	$ 1,678,633	$ 1,464,193	$ 1,583,549	$ 1,428,922	$ 1,444,419	$ 1,404,235	$ 1,328,024	$ 1,171,805	$ 6,911,676	$ 6,155,297	$ 5,348,483
Operating income (loss)													580,027	469,594	329,727
Assets	6,054,042				5,865,900								6,054,042	5,865,900
Goodwill	1,510,279				1,287,180				540,952				1,510,279	1,287,180	540,952
Capital expenditures													198,455	192,498	157,141
Depreciation and amortization													224,010	169,231	132,328
Connected Car [Member]
Segment Reporting Information [Line Items]
Goodwill	164,771				20,749				17,080				164,771	20,749	17,080
Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Goodwill	147,977				152,350				137,950				147,977	152,350	137,950
Professional Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	385,609				387,861				$ 385,922				385,609	387,861	385,922
Connected Services [Member]
Segment Reporting Information [Line Items]
Goodwill	811,922				726,220								811,922	726,220
Operating Segments [Member] | Connected Car [Member]
Segment Reporting Information [Line Items]
Net sales													3,101,838	2,911,166	2,626,354
Operating income (loss)													359,255	294,121	159,567
Assets	1,931,762				1,396,618								1,931,762	1,396,618
Goodwill	164,771				20,749								164,771	20,749
Capital expenditures													94,114	117,318	91,472
Depreciation and amortization													79,930	69,617	65,449
Operating Segments [Member] | Lifestyle Audio [Member]
Segment Reporting Information [Line Items]
Net sales													2,137,752	1,812,579	1,576,789
Operating income (loss)													266,655	196,138	169,416
Assets	1,076,340				1,243,135								1,076,340	1,243,135
Goodwill	147,977				152,350								147,977	152,350
Capital expenditures													51,820	40,669	43,007
Depreciation and amortization													57,254	40,601	33,215
Operating Segments [Member] | Professional Solutions [Member]
Segment Reporting Information [Line Items]
Net sales													1,014,463	1,048,964	853,144
Operating income (loss)													69,775	102,002	114,057
Assets	1,139,989				1,122,209								1,139,989	1,122,209
Goodwill	385,609				387,861								385,609	387,861
Capital expenditures													28,144	21,263	12,532
Depreciation and amortization													34,757	34,112	20,866
Operating Segments [Member] | Connected Services [Member]
Segment Reporting Information [Line Items]
Net sales													694,307	380,992	291,855
Operating income (loss)													35,293	40,492	36,938
Assets	1,378,976				1,452,962								1,378,976	1,452,962
Goodwill	811,922				726,220								811,922	726,220
Capital expenditures													10,013	7,513	35
Depreciation and amortization													43,535	16,312	1,828
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net sales													39	1,596	341
Operating income (loss)													(150,951)	(163,159)	(150,251)
Assets	$ 526,975				$ 650,976								526,975	650,976
Capital expenditures													14,364	5,735	10,095
Depreciation and amortization													8,534	$ 8,589	$ 10,970
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales													$ (36,723)