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Acquisitions - Additional Information (Detail) $ / shares in Units, ¥ in Millions, $ in Millions				12 Months Ended
	Oct. 01, 2014 USD ($) ¥ / $	Oct. 01, 2014 JPY (¥) ¥ / $	Nov. 07, 2013 USD ($) $ / shares shares	Jun. 25, 2016 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jun. 30, 2016 USD ($)	Jun. 25, 2016 JPY (¥)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 JPY (¥)	Mar. 31, 2015 USD ($)	Mar. 31, 2015 JPY (¥)
Business Acquisition [Line Items]
Shares issued to former Validity shareholders, Value					$ 21.5	$ 75.8
Additional purchase consideration settled											$ 48.6	¥ 5,780
Validity Sensors, Inc [Member]
Business Acquisition [Line Items]
Acquired outstanding common and preferred shares and voting interest			100.00%
Fair value of the consideration transferred totaled			$ 127.8
Shares issued to former Validity shareholders, Shares | shares			1,577,559
Shares issued to former Validity shareholders, Value			$ 70.3
Closing price of common stock | $ / shares			$ 44.55
Initial purchase price of acquisition			$ 20.0
Validity Sensors, Inc [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Acquisition-related liabilities							$ 25.5
Renesas SP Drivers, Inc. [Member]
Business Acquisition [Line Items]
Acquired outstanding common and preferred shares and voting interest	100.00%	100.00%
Fair value of the consideration transferred totaled	$ 468.0
Acquisition closing effective date				Oct. 01, 2014
Initial purchase price of acquisition	$ 463.0	¥ 50,600
Foreign currency exchange rate (Japanese yen to U.S. dollar) | ¥ / $	109.4	109.4
Indemnification hold back	$ 66.0	¥ 7,250
Working capital hold back	48.0	¥ 5,250
Additional purchase price consideration	$ 4.8
Inventory purchase obligation settled					$ 115.0
IIX Inc [Member]
Business Acquisition [Line Items]
Indemnification Holdback Liability Non-current				$ 6.2				¥ 648	$ 6.2	¥ 648

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