Stockholders equity (Detail) (USD $)	67 Months Ended	1 Months Ended		6 Months Ended	12 Months Ended	1 Months Ended
	Apr. 30, 2014	Oct. 31, 2009 Common Stock	Oct. 31, 2008 Common Stock	Apr. 30, 2014 Common Stock	Oct. 31, 2009 Common Stock	Mar. 31, 2009 Common Stock Public Offering [Member]	Sep. 30, 2008 Common Stock Founder [Member] Private Placement [Member]
Stockholders Equity Note [Line Items]
Shares issued			96,000,000		9,600,000	9,600,000	96,000,000
Proceeds from issuance of shares	$ 21,000					$ 12,000	$ 9,000
Stock split, number of shares issued for each share held		8
Stock split, distribution date				October 2009