Commitments and Contingencies (Details) - Charitable Gift [Member] - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Jan. 31, 2018
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	$ 5,000
Selling, General and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	4,503	$ 0
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency, Accrual, Current	1,394	0
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency, Accrual, Noncurrent	$ 3,109	$ 0