Income Tax Income Tax Disclosure	9 Months Ended
Oct. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Disclosure	INCOME TAXES The Company’s effective tax rate varies from the federal statutory rate primarily due to state and local taxes, research and development tax credit, tax benefits on qualified production activities, and tax-exempt insurance premiums. The Company’s effective tax rates for the nine-month periods ended October 31, 2017 and 2016 were 31.3% and 26.9%, respectively. The increase in the effective tax rate is primarily due to higher pre-tax income in the current year and recognition of discrete tax expense related to the Company's adoption of ASU 2016-09 in the fiscal 2018 as further discussed in Note 2 Summary of Significant Accounting Policies. This ASU requires that the tax effects resulting from the settlement of stock-based awards be recognized as a discrete income tax expense or benefit in the income statement in the reporting period in which they occur.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

Name:	us-gaap_IncomeTaxDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration