Equity-Based Compensation - Valuation Assumptions of Stock Options (Detail)	6 Months Ended
	Jul. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-average expected volatility	56.10%
Expected dividend yield	0.00%
Risk-free interest rate	0.60%
Expected term (in years)	1 year 10 months 24 days
Exercise multiple factor	1.4
Post-vesting forfeiture	20.30%