Stockholders' Equity (Stock Option Activity) (Details) - Options	1 Months Ended	12 Months Ended
	Jan. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2016 USD ($) $ / shares item shares
Number of Shares
Unvested time-based stock options outstanding	894,899	596,598
Outstanding, beginning of period		894,899
Granted	894,899
Exercised
Canceled
Outstanding, end of period	894,899	894,899
Exercisable, end of period		298,301
Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares		$ 39.08
Granted | $ / shares	$ 39.08
Exercised | $ / shares
Canceled | $ / shares
Outstanding, end of period | $ / shares	$ 39.08	$ 39.08
Exercisable, end of period | $ / shares		$ 39.08
Weighted Average Remaining Contractual Life (in years)
Outstanding	9 years 11 months 16 days	8 years 11 months 16 days
Exercisable, end of period		8 years 11 months 16 days
Aggregate Intrinsic Value
Outstanding | $	$ 205,800
Vesting period		3 years
Vesting installments | item		3
Expiration period		10 years
Share based compensation | $	200,000	$ 3,900,000
Unrecognized stock-based compensation related to options | $	$ 11,300,000	$ 7,500,000
Compensation costs not yet recognized, weighted-average period of recognition	2 years 10 months 13 days	1 year 10 months 13 days