Goodwill (Tables)

12 Months Ended

Mar. 31, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the fiscal years ended March 31, 2012 and 2013 were as follows:

	For the year ended March 31,
	2012						2013
	Gross		Accumulated impairment		Net		Gross		Accumulated impairment		Net
	US$		US$		US$		US$		US$		US$
As at beginning of the year		10,515,168		8,515,168		2,000,000		10,515,168		8,515,168		2,000,000
Impairment		—		—		—		—		2,000,000		2,000,000
As at end of the year		10,515,168		8,515,168		2,000,000		10,515,168		10,515,168		—