Commitments and Contingencies Commitments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2018	Jan. 31, 2021	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2020
Loss Contingencies [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months		$ 40,000
Charitable Gift
Loss Contingencies [Line Items]
Long-term purchase commitment, amount				$ 5,000
Loss Contingency, Loss in Period			$ 4,503
Loss Contingency, Accrual, Current		691			$ 691
Loss Contingency, Accrual, Noncurrent		1,300			1,916
Loss Contingency Accrual		1,991			$ 2,607
Loss Contingency Accrual, Payments		$ 2,860
Selling, General and Administrative Expenses | Charitable Gift
Loss Contingencies [Line Items]
Loss Contingency, Loss in Period	$ 4,503