Basis of Presentation and Nature of Operations	9 Months Ended
Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Nature of Operations	Basis of Presentation and Nature of Operations Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. GAAP for interim financial information. As such, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments, except as disclosed herein) considered necessary for a fair statement have been included. Results of operations for the three and nine months ended June 30, 2018 are not necessarily indicative of results to be expected for the fiscal year ending September 30, 2018. Quarterly financial data should be read in conjunction with the consolidated financial statements and accompanying notes for the fiscal year ended September 30, 2017 included in the Company's Annual Report on Form 10-K filed with the SEC on December 7, 2017. The Company recorded out-of-period adjustments during the three and nine months ended June 30, 2018 to correct errors in the tax provision and accrued costs. The net impact of these adjustments for the nine months ended June 30, 2018 was an increase to revenue of $0.4 million, a decrease to gross profit of $0.9 million and a decrease to net income $2.0 million. The net impact of the adjustment for the three months ended June 30, 2018 was an increase to revenue of $1.0 million, a decrease to gross profit of $1.8 million and a decrease to net income of $2.8 million. The Company does not believe these adjustments are material, individually or in the aggregate, to its unaudited Condensed Consolidated Financial Statements for the three and nine months ended June 30, 2018, nor does it believe such items are material to any of its previously issued annual or quarterly financial statements, or its expected 2018 annual financial statements. The consolidated financial data as of September 30, 2017 presented in these unaudited condensed consolidated financial statements were derived from the Company’s audited consolidated financial statements, but do not include all disclosures required by U.S. GAAP. Nature of Operations The Company is a global distributor of chemicals products in North America and Asia and a global distributor of plastics in North America, EMEA and Asia. In North America, primarily in the U.S., the Company provides on-site and off-site hazardous and non-hazardous environmental services, including waste collection, transportation, recovery, disposal arrangement and recycling services. The Company offers its customers products used in a broad cross-section of end markets including household, industrial and institutional, lubricants, performance coatings (including architectural coatings, adhesives, sealants and elastomers), automotive, healthcare, personal care, oil and gas and construction. In connection with the distribution of chemicals products, the Company provides value-added services such as custom blending, packaging and re-packaging, private-label manufacturing and product testing in the form of chemical analysis, product performance analysis and product development.

Basis of Presentation and Nature of Operations

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. GAAP for interim financial information. As such, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments, except as disclosed herein) considered necessary for a fair statement have been included. Results of operations for the three and nine months ended June 30, 2018 are not necessarily indicative of results to be expected for the fiscal year ending September 30, 2018. Quarterly financial data should be read in conjunction with the consolidated financial statements and accompanying notes for the fiscal year ended September 30, 2017 included in the Company's Annual Report on Form 10-K filed with the SEC on December 7, 2017.

The Company recorded out-of-period adjustments during the three and nine months ended June 30, 2018 to correct errors in the tax provision and accrued costs. The net impact of these adjustments for the nine months ended June 30, 2018 was an increase to revenue of $0.4 million, a decrease to gross profit of $0.9 million and a decrease to net income $2.0 million. The net impact of the adjustment for the three months ended June 30, 2018 was an increase to revenue of $1.0 million, a decrease to gross profit of $1.8 million and a decrease to net income of $2.8 million. The Company does not believe these adjustments are material, individually or in the aggregate, to its unaudited Condensed Consolidated Financial Statements for the three and nine months ended June 30, 2018, nor does it believe such items are material to any of its previously issued annual or quarterly financial statements, or its expected 2018 annual financial statements.

The consolidated financial data as of September 30, 2017 presented in these unaudited condensed consolidated financial statements were derived from the Company’s audited consolidated financial statements, but do not include all disclosures required by U.S. GAAP.

Nature of Operations

The Company is a global distributor of chemicals products in North America and Asia and a global distributor of plastics in North America, EMEA and Asia. In North America, primarily in the U.S., the Company provides on-site and off-site hazardous and non-hazardous environmental services, including waste collection, transportation, recovery, disposal arrangement and recycling services. The Company offers its customers products used in a broad cross-section of end markets including household, industrial and institutional, lubricants, performance coatings (including architectural coatings, adhesives, sealants and elastomers), automotive, healthcare, personal care, oil and gas and construction. In connection with the distribution of chemicals products, the Company provides value-added services such as custom blending, packaging and re-packaging, private-label manufacturing and product testing in the form of chemical analysis, product performance analysis and product development.