Subsequent Event (Details) (Hua Hong Semiconductor Company [Member]) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014 USD ($)	Oct. 31, 2014 Subsequent Event USD ($)	Oct. 31, 2014 Subsequent Event HKD
Subsequent Event [Line Items]
Hua Hong Semiconductor Limited shares owned by Microchip Technology	27,964,822
Carrying value of Hua Hong Semiconductor shares owned	$ 3.6
Cost Method Investments, Fair Value Disclosure		$ 39.2
Share Price		$ 1.40	10.88