Basis of Presentation	6 Months Ended
Jan. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation The consolidated balance sheet as of July 31, 2016, which has been derived from audited consolidated financial statements, and the unaudited condensed consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting. As permitted under those requirements, certain footnotes or other financial information that are normally required by generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted. The Company believes that the disclosures made are adequate to make the information not misleading and in the opinion of management reflect all adjustments, including those of a normal recurring nature, that are necessary for a fair presentation of financial position and results of operations for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of results of operations to be expected for the full year. The unaudited condensed consolidated financial statements included herein should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended July 31, 2016. These condensed consolidated financial statements are prepared using certain estimates by management and include the accounts of KMG Chemicals, Inc. and its subsidiaries (collectively, the “Company”). All significant intercompany balances and transactions have been eliminated in consolidation. In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017‑01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”). ASU 2017-01 affects all companies and other reporting organizations that must determine whether they have acquired or sold a business. For public companies, the amendments are effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The Company will apply the guidance to acquisitions occurring after the effective date to determine whether such acquisitions meet the definition of a business. In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (“ASU 2017-04”). To simply the subsequent measurement of goodwill, ASU 2017-04 eliminates step two from the goodwill impairment test. A public business entity should adopt the amendments for its annual goodwill impairment tests or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The guidance could impact the Company if a goodwill impairment is identified after adoption. The Company plans to adopt the guidance effective August 1, 2017. In August 2016, the FASB issued ASU No. 2016‑18, “Statement of Cash Flows (Topic 230): Restricted Cash” (“ASU 2016‑18”). ASU 2016-18 is intended to address diversity in practice that exists in the classification and presentation of changes in restricted cash on the statement of cash flows. The amendments require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU 2016-18 during the three months ended January 31, 2017 and disclosure revisions have been made for the periods presented on the condensed consolidated statements of cash flows. See note 3. In August 2016, the FASB issued ASU No. 2016‑15, “Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments” (“ASU 2016-15”). ASU 2016-15 is intended to address how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU 2016-15 at the beginning of fiscal year 2017, but there was no impact on the consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments—Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments." ASU 2016-13 changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for a fiscal year beginning after December 15, 2018, including interim periods within that fiscal year. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company is evaluating the new guidance but does not believe this standard will have a material impact on its consolidated financial statements, as the Company has not experienced significant losses related to its credit accounts. The Company plans to adopt the guidance effective August 1, 2020, the beginning of the first fiscal period after the effective date. In March 2016, the FASB issued ASU No. 2016-09, “Compensation—Stock Compensation (Topic 718), Improvements to Employee Share-based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions for both public and nonpublic entities, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. ASU 2016-09 is effective for annual periods beginning after December 15, 2017, and interim periods within annual periods beginning after December 15, 2018. Early adoption is permitted. The Company has elected to early adopt this ASU beginning in the second quarter of fiscal year 2017, and has applied the effects of the adoption from the beginning of the annual period of adoption. During the three and six month periods ended January 31, 2017, stock-based compensation excess tax benefits or deficiencies are reflected in the consolidated statements of income as a component of the provision for income taxes, whereas they previously were recognized in additional paid in capital on the condensed consolidated balance sheets. Additionally, the consolidated statements of cash flows presents excess tax benefits as an operating activity for the six months ended January 31, 2017, while the historical periods have not been adjusted, which is consistent with the adoption of this portion of the standard on a prospective basis. Further, tax cash payments made on an employee’s behalf for shares withheld upon vesting or settlement are required to be presented as a financing activity, and the consolidated statement of cash flows for the six months ended January 31, 2017 has been revised to reflect these amounts as payments related to stock-based awards. Tax cash payments made on an employee’s behalf for shares withheld upon vesting or settlement for the six months ended January 31, 2016 were immaterial to the condensed consolidated financial statements. Additionally, the Company did not have any unrecognized tax benefits related to its share-based payment awards at the date of adoption. Finally, the Company has elected to account for forfeitures as they occur, rather than estimate expected forfeitures. Historically, estimated forfeitures were immaterial to the consolidated financial statements. The amendments in the standard that required use of a modified retrospective transition method did not materially impact the Company. Therefore, the Company did not recognize a cumulative-effect adjustment to retained earnings upon adoption as of August 1, 2016. See note 12 for information regarding the additional impact on the consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” which is intended to increase transparency and comparability of accounting for lease transactions. The ASU will require all leases with lease terms exceeding one year to be recognized on the balance sheet as lease assets and lease liabilities and will require both quantitative and qualitative disclosures regarding key information about leasing arrangements. Lessor accounting is largely unchanged. The guidance is effective beginning January 1, 2019 with an option to early adopt. The Company is currently scoping its significant lease arrangements to assess the potential impact on its consolidated financial statements. The Company plans to adopt the guidance effective October 31, 2019. In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”, which requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The new guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. In August 2015, the FASB voted to delay the effective date of ASU 2014-09 by one year to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. Adoption can occur using one of two prescribed transition methods. In March, April and December 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net)”, ASU 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing,” and ASU 2016-20, “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers,” which provide supplemental adoption guidance and clarification to ASC 2014-09. ASU 2016-08, ASU 2016-10 and ASU 2016-20 must be adopted concurrently with the adoption of ASU 2014-09. The Company is currently scoping its revenue contracts to assess the potential impact on its consolidated financial statements. The Company plans to adopt the revenue guidance effective October 31, 2018, although it has not yet selected a transition method.

1. Basis of Presentation

The consolidated balance sheet as of July 31, 2016, which has been derived from audited consolidated financial statements, and the unaudited condensed consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting. As permitted under those requirements, certain footnotes or other financial information that are normally required by generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted. The Company believes that the disclosures made are adequate to make the information not misleading and in the opinion of management reflect all adjustments, including those of a normal recurring nature, that are necessary for a fair presentation of financial position and results of operations for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of results of operations to be expected for the full year. The unaudited condensed consolidated financial statements included herein should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended July 31, 2016.

These condensed consolidated financial statements are prepared using certain estimates by management and include the accounts of KMG Chemicals, Inc. and its subsidiaries (collectively, the “Company”). All significant intercompany balances and transactions have been eliminated in consolidation.

In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017‑01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”). ASU 2017-01 affects all companies and other reporting organizations that must determine whether they have acquired or sold a business. For public companies, the amendments are effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The Company will apply the guidance to acquisitions occurring after the effective date to determine whether such acquisitions meet the definition of a business.

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (“ASU 2017-04”). To simply the subsequent measurement of goodwill, ASU 2017-04 eliminates step two from the goodwill impairment test. A public business entity should adopt the amendments for its annual goodwill impairment tests or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The guidance could impact the Company if a goodwill impairment is identified after adoption. The Company plans to adopt the guidance effective August 1, 2017.

In August 2016, the FASB issued ASU No. 2016‑18, “Statement of Cash Flows (Topic 230): Restricted Cash” (“ASU 2016‑18”). ASU 2016-18 is intended to address diversity in practice that exists in the classification and presentation of changes in restricted cash on the statement of cash flows. The amendments require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU 2016-18 during the three months ended January 31, 2017 and disclosure revisions have been made for the periods presented on the condensed consolidated statements of cash flows. See note 3.

In August 2016, the FASB issued ASU No. 2016‑15, “Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments” (“ASU 2016-15”). ASU 2016-15 is intended to address how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The amendments are effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company early adopted ASU 2016-15 at the beginning of fiscal year 2017, but there was no impact on the consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments—Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments." ASU 2016-13 changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for a fiscal year beginning after December 15, 2018, including interim periods within that fiscal year. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company is evaluating the new guidance but does not believe this standard will have a material impact on its consolidated financial statements, as the Company has not experienced significant losses related to its credit accounts. The Company plans to adopt the guidance effective August 1, 2020, the beginning of the first fiscal period after the effective date.

In March 2016, the FASB issued ASU No. 2016-09, “Compensation—Stock Compensation (Topic 718), Improvements to Employee Share-based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for employee share-based payment transactions for both public and nonpublic entities, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. ASU 2016-09 is effective for annual periods beginning after December 15, 2017, and interim periods within annual periods beginning after December 15, 2018. Early adoption is permitted. The Company has elected to early adopt this ASU beginning in the second quarter of fiscal year 2017, and has applied the effects of the adoption from the beginning of the annual period of adoption. During the three and six month periods ended January 31, 2017, stock-based compensation excess tax benefits or deficiencies are reflected in the consolidated statements of income as a component of the provision for income taxes, whereas they previously were recognized in additional paid in capital on the condensed consolidated balance sheets. Additionally, the consolidated statements of cash flows presents excess tax benefits as an operating activity for the six months ended January 31, 2017, while the historical periods have not been adjusted, which is consistent with the adoption of this portion of the standard on a prospective basis. Further, tax cash payments made on an employee’s behalf for shares withheld upon vesting or settlement are required to be presented as a financing activity, and the consolidated statement of cash flows for the six months ended January 31, 2017 has been revised to reflect these amounts as payments related to stock-based awards. Tax cash payments made on an employee’s behalf for shares withheld upon vesting or settlement for the six months ended January 31, 2016 were immaterial to the condensed consolidated financial statements. Additionally, the Company did not have any unrecognized tax benefits related to its share-based payment awards at the date of adoption. Finally, the Company has elected to account for forfeitures as they occur, rather than estimate expected forfeitures. Historically, estimated forfeitures were immaterial to the consolidated financial statements. The amendments in the standard that required use of a modified retrospective transition method did not materially impact the Company. Therefore, the Company did not recognize a cumulative-effect adjustment to retained earnings upon adoption as of August 1, 2016. See note 12 for information regarding the additional impact on the consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” which is intended to increase transparency and comparability of accounting for lease transactions. The ASU will require all leases with lease terms exceeding one year to be recognized on the balance sheet as lease assets and lease liabilities and will require both quantitative and qualitative disclosures regarding key information about leasing arrangements. Lessor accounting is largely unchanged. The guidance is effective beginning January 1, 2019 with an option to early adopt. The Company is currently scoping its significant lease arrangements to assess the potential impact on its consolidated financial statements. The Company plans to adopt the guidance effective October 31, 2019.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”, which requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The new guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. In August 2015, the FASB voted to delay the effective date of ASU 2014-09 by one year to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. Adoption can occur using one of two prescribed transition methods. In March, April and December 2016, the FASB issued ASU 2016-08, “Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net)”, ASU 2016-10, “Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing,” and ASU 2016-20, “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers,” which provide supplemental adoption guidance and clarification to ASC 2014-09. ASU 2016-08, ASU 2016-10 and ASU 2016-20 must be adopted concurrently with the adoption of ASU 2014-09. The Company is currently scoping its revenue contracts to assess the potential impact on its consolidated financial statements. The Company plans to adopt the revenue guidance effective October 31, 2018, although it has not yet selected a transition method.