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Summary of business and significant accounting policies (Details) (USD $)
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0 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | ||||
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Aug. 05, 2014
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Oct. 31, 2014
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Jul. 14, 2014
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Jan. 31, 2014
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Aug. 05, 2014
IPO
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Jul. 14, 2014
Dividend Declared
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Oct. 31, 2014
Increase in Prepaid Expenses and Additional Paid-in Capital
Error in Calculation of Tax Benefits
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Oct. 31, 2014
Decrease in Cash Provided by Operating Activities
Error in Calculation of Tax Benefits
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| Class of Stock [Line Items] | ||||||||
| Shares of common stock issued | 10,465,000 | |||||||
| IPO price per share | $ 14.00 | |||||||
| Net proceeds from IPO | $ 132,600,000 | |||||||
| Underwriters discount and commission | 10,200,000 | |||||||
| Other offering expenses payable | 3,700,000 | |||||||
| Common and preferred stock, shares authorized | 1,000,000,000 | |||||||
| Common stock, shares authorized | 900,000,000 | 900,000,000 | 900,000,000 | |||||
| Preferred stock, shares authorized | 100,000,000 | 100,000,000 | 100,000,000 | |||||
| Preferred Stock, par value per share | $ 0.0001 | $ 0.0001 | $ 0.0001 | |||||
| Dividends declared | 50,000,000 | 50,000,000 | ||||||
| Decrease in exercise price to record an adjustment to outstanding stock options | $ 1.00 | |||||||
| Preferred stock converted to common stock ( in shares) | 32,486,588 | |||||||
| Adjustment for error caused by using incorrect fair value for calculation Tax benefit | $ 1,000,000 | $ 1,000,000 | ||||||