Income Taxes - Additional Information (Details) $ in Millions	3 Months Ended
	Apr. 30, 2016 USD ($)
Income Taxes [Line Items]
Deferred tax assets	$ 82.3
Deferred tax liabilities	19.5
Deferred tax assets, valuation allowance	63.0
Alternative minimum tax credits carryforwards	2.3
Unrecognized tax benefit	3.0
Federal
Income Taxes [Line Items]
Net operating loss carryforwards	145.6
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards	$ 81.5
Domestic Tax Authority
Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2036
Net operating loss carryforwards, stock compensation deductions	$ 12.5
Hong Kong
Income Taxes [Line Items]
Net operating loss carryforwards	0.1
Canada
Income Taxes [Line Items]
Net operating loss carryforwards	$ 2.5