Redeemable Convertible Preferred Stock and Warrants	12 Months Ended
Jan. 31, 2017
Temporary Equity Disclosure [Abstract]
Redeemable Convertible Preferred Stock and Warrants	Note 15. Redeemable Convertible Preferred Stock and Warrants Redeemable Convertible Preferred Stock Upon the completion of our IPO in January 2015, our previously authorized and outstanding redeemable convertible preferred stock was converted and reclassified into 88,228,210 shares of Class B common stock, which includes 85,354 shares of Class B common stock issued in connection with the net exercise of our Series A redeemable convertible preferred stock warrant discussed below, and 4,404,759 incremental shares of Class B common stock issued to holders of our Series F redeemable convertible preferred stock in accordance with their contractual conversion rights which stated that if we consummated an initial public offering on or prior to July 7, 2015, each share of Series F redeemable convertible preferred stock would convert into shares of Class B common stock equal to lesser of (i) $20.00 divided by the lesser of 90% of the price per share of Class A common stock sold in the initial public offering or (ii) $20.00. The additional shares resulted in a beneficial conversion feature, and we recognized a $2.3 million deemed dividend to Series F redeemable convertible preferred stockholders upon the completion of our IPO. Accretion of Redeemable Convertible Preferred Stock Prior to the completion of our IPO in January 2015, stock issuance costs incurred related to our redeemable convertible preferred stock were accreted using the effective interest method via a charge to additional paid in capital over the period from the issuance date to the date at which the redeemable convertible preferred stock would have become redeemable at the option of the holders. Additionally, in the event of any liquidation, dissolution, or winding up of Box, Inc., whether voluntary or involuntary, the holders of our Series F redeemable convertible preferred stock were entitled to receive an amount equal to $20.00 plus an additional amount equal to $3.00 per year accruing quarterly and any accrued or declared but unpaid dividends. As a result, we were required to accrete the carrying value of our Series F redeemable convertible preferred stock to its redemption value over the period from issuance through the earlier of (i) the redemption date or (ii) the last quarterly anniversary of issuance occurring prior to the completion of an IPO. We recorded redeemable convertible preferred stock accretion of $11.5 million during the year ended January 31, 2015. Redeemable Convertible Preferred Stock Warrants Until immediately prior to the completion of our IPO in January 2015, there were 87,140 Series A redeemable convertible preferred stock warrants outstanding with an exercise price per share of $0.29. The fair value of these warrants was $1.2 million as of our IPO in January 2015. We issued 85,354 shares of Series A redeemable convertible preferred stock upon the net exercise of our Series A redeemable convertible preferred stock warrant, which occurred immediately prior to the completion of our IPO. These shares were converted and reclassified into an equivalent number of shares of our Class B common stock upon the completion of our IPO. As a result, we reclassified our redeemable convertible preferred stock warrant liability balance to additional-paid-in capital upon the completion of our IPO.

Note 15. Redeemable Convertible Preferred Stock and Warrants

Redeemable Convertible Preferred Stock

Upon the completion of our IPO in January 2015, our previously authorized and outstanding redeemable convertible preferred stock was converted and reclassified into 88,228,210 shares of Class B common stock, which includes 85,354 shares of Class B common stock issued in connection with the net exercise of our Series A redeemable convertible preferred stock warrant discussed below, and 4,404,759 incremental shares of Class B common stock issued to holders of our Series F redeemable convertible preferred stock in accordance with their contractual conversion rights which stated that if we consummated an initial public offering on or prior to July 7, 2015, each share of Series F redeemable convertible preferred stock would convert into shares of Class B common stock equal to lesser of (i) $20.00 divided by the lesser of 90% of the price per share of Class A common stock sold in the initial public offering or (ii) $20.00. The additional shares resulted in a beneficial conversion feature, and we recognized a $2.3 million deemed dividend to Series F redeemable convertible preferred stockholders upon the completion of our IPO.

Accretion of Redeemable Convertible Preferred Stock

Prior to the completion of our IPO in January 2015, stock issuance costs incurred related to our redeemable convertible preferred stock were accreted using the effective interest method via a charge to additional paid in capital over the period from the issuance date to the date at which the redeemable convertible preferred stock would have become redeemable at the option of the holders. Additionally, in the event of any liquidation, dissolution, or winding up of Box, Inc., whether voluntary or involuntary, the holders of our Series F redeemable convertible preferred stock were entitled to receive an amount equal to $20.00 plus an additional amount equal to $3.00 per year accruing quarterly and any accrued or declared but unpaid dividends. As a result, we were required to accrete the carrying value of our Series F redeemable convertible preferred stock to its redemption value over the period from issuance through the earlier of (i) the redemption date or (ii) the last quarterly anniversary of issuance occurring prior to the completion of an IPO.

We recorded redeemable convertible preferred stock accretion of $11.5 million during the year ended January 31, 2015.

Redeemable Convertible Preferred Stock Warrants

Until immediately prior to the completion of our IPO in January 2015, there were 87,140 Series A redeemable convertible preferred stock warrants outstanding with an exercise price per share of $0.29. The fair value of these warrants was $1.2 million as of our IPO in January 2015. We issued 85,354 shares of Series A redeemable convertible preferred stock upon the net exercise of our Series A redeemable convertible preferred stock warrant, which occurred immediately prior to the completion of our IPO. These shares were converted and reclassified into an equivalent number of shares of our Class B common stock upon the completion of our IPO. As a result, we reclassified our redeemable convertible preferred stock warrant liability balance to additional-paid-in capital upon the completion of our IPO.