Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended		1 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012	Oct. 26, 2011	Jun. 30, 2014 Convertible Senior Notes [Member]	Oct. 10, 2012 Convertible Senior Notes [Member]	Jun. 26, 2013 New Buyback Program [Member]	Jun. 30, 2014 New Buyback Program [Member]	Jun. 30, 2014 Income Taxes [Member]	Jun. 30, 2013 Income Taxes [Member]	Jun. 30, 2012 Income Taxes [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]
Accounting Policies [Line Items]
Uncollectible accounts receivable	$ 9,600,000	$ 11,200,000
Product warranty periods, minimum (months)	6 months
Product warranty periods, maximum (years)	6 years
Research and development, net	343,800,000	285,300,000	331,900,000
Amortization of original issue discount on debt securities	2,200,000	8,500,000	19,100,000		0
Convertible Senior Notes paid					400,000,000	400,000,000
Convertible senior notes, interest rate					1.25%
Convertible senior notes, maturity					Oct. 15, 2012
Restricted cash on hand	7,800,000	10,400,000
Minimum percentage of likelihood for the determination of more-likely-than-not threshold for goodwill impairment	50.00%
Approximate useful life												10 months	17 years
Indefinite-lived intangible assets	80,100,000
Impairment of long-lived assets held-for-sale	700,000	700,000	600,000
Unbilled costs related to pre-production costs	75,100,000	79,000,000
Unbilled costs reimbursable in the next 12 months totaled	25,300,000	25,000,000
Unbilled costs reimbursable in subsequent years	49,800,000	54,000,000
Purchase and own pursuant to long-term supply arrangements for molds, dies and other tools	20,000,000	16,900,000
Income tax expense (benefit)	72,610,000	31,729,000	(68,388,000)						(1,300,000)	2,900,000	(124,200,000)
Board of Directors authorized the repurchase of common stock				200,000,000			200,000,000
Board of Directors authorized the additional repurchase of common stock							$ 200,000,000
Expiry date of share buyback program	Jun. 25, 2014							Jun. 26, 2014