Significant Accounting Policies (Policies)	3 Months Ended
Jul. 31, 2016
Accounting Policies [Abstract]
Recently Adopted and Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes, an amendment to FASB ASC Topic 740, which simplifies the presentation of deferred income taxes on an entity’s classified balance sheet. Currently, entities that are required to issue a classified balance sheet present a net current and net noncurrent deferred income tax asset or liability for each tax jurisdiction. The amendments in this ASU require entities to offset all deferred income tax assets and liabilities for each tax jurisdiction and present a net deferred income tax asset or liability as a single noncurrent amount. The recognition and measurement guidance for deferred income tax assets and liabilities are not affected by this amendment. This amended guidance is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted and the standard may be applied either retrospectively or on a prospective basis to all deferred income tax assets and liabilities. We early adopted this amendment during the third quarter of fiscal 2016 on a retrospective basis. Accordingly, we reclassified our current deferred income taxes to noncurrent on our August 2, 2015 Consolidated Balance Sheet, which increased noncurrent deferred income taxes $4.0 million and decreased noncurrent deferred tax liabilities $3.0 million. In June 2014, the Financial Accounting Standards Board (“FASB”) amended its authoritative guidance on accounting for certain share-based payment awards. The amended guidance requires that share-based compensation awards with terms of a performance target that affects vesting, and that could be achieved after the requisite service period, be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award and compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved. The guidance will permit an entity to apply the amendments in the update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the consolidated financial statements and to all new or modified awards thereafter. This guidance was effective for the first quarter of fiscal 2017 and did not have any impact on our consolidated financial statements as we currently do not have any share-based payment awards with terms of a performance target that affects vesting and could be achieved after the requisite service period. Recently Issued Accounting Pronouncements In May 2014, the FASB issued ASU No. 2014-09, which amends ASC Topic 606, Revenue from Contracts with Customers. The amendments in this ASU are intended to enhance the comparability of revenue recognition practices and will be applied to all contracts with customers. Improved disclosures related to the nature, amount, timing, and uncertainty of revenue that is recognized are requirements under the amended guidance. In April 2015, the FASB issued ASU 2015-24, Revenue from Contracts with Customers: Deferral of the Effective Date which proposed a deferral of the effective date by one year, and on July 7, 2015, the FASB decided to delay the effective date by one year. The deferral results in the new revenue standard being effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. We are therefore required to apply the new revenue guidance in our fiscal 2019 interim and annual financial statements. This ASU can be adopted either retrospectively or as a cumulative-effect adjustment as of the date of adoption. We are currently assessing the impact that this guidance will have on our consolidated financial statements. In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which changed the measurement principle for inventory from the lower of cost or market to lower of cost and net realizable value. This ASU is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2016. We are therefore required to apply this guidance in our fiscal 2018 interim and annual financial statements. We are currently assessing the impact that this guidance will have on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which increases transparency and comparability among companies accounting for lease transactions. The most significant change of this update will require the recognition of lease assets and liabilities on the balance sheet for operating lease arrangements with lease terms greater than twelve months for lessees. This update will require a modified retrospective application which includes a number of optional practical expedients related to the identification and classification of leases commenced before the effective date. This ASU is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2018. We are therefore required to apply this guidance in our fiscal 2020 interim and annual financial statements. We are currently assessing the impact that this guidance will have on our consolidated financial statements. In March 2016, the FASB issued ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Shares-Based Payment Accounting." ASU 2016-09 is intended to improve the accounting for share-based payment transactions as part of the FASB’s simplification initiative. ASU 2016-09 changes several aspects of the accounting for share-based payment award transactions, including: (1) accounting for income taxes; (2) classification of excess tax benefits on the statement of cash flows; (3) forfeitures; (4) minimum statutory tax withholding requirements; and (5) classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax-withholding purposes. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those years for public companies. We are therefore required to apply this guidance in our fiscal 2018 interim and annual financial statements. We are currently assessing the impact that ASU 2016-09 will have on its consolidated financial statements. There are no other new accounting pronouncements that are expected to have a significant impact on our consolidated financial statements.

Recently Adopted Accounting Pronouncements

In November 2015, the FASB issued ASU No. 2015-17, Balance Sheet Classification of Deferred Taxes, an amendment to FASB ASC Topic 740, which simplifies the presentation of deferred income taxes on an entity’s classified balance sheet. Currently, entities that are required to issue a classified balance sheet present a net current and net noncurrent deferred income tax asset or liability for each tax jurisdiction. The amendments in this ASU require entities to offset all deferred income tax assets and liabilities for each tax jurisdiction and present a net deferred income tax asset or liability as a single noncurrent amount. The recognition and measurement guidance for deferred income tax assets and liabilities are not affected by this amendment. This amended guidance is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted and the standard may be applied either retrospectively or on a prospective basis to all deferred income tax assets and liabilities.

We early adopted this amendment during the third quarter of fiscal 2016 on a retrospective basis. Accordingly, we reclassified our current deferred income taxes to noncurrent on our August 2, 2015 Consolidated Balance Sheet, which increased noncurrent deferred income taxes $4.0 million and decreased noncurrent deferred tax liabilities $3.0 million.

In June 2014, the Financial Accounting Standards Board (“FASB”) amended its authoritative guidance on accounting for certain share-based payment awards. The amended guidance requires that share-based compensation awards with terms of a performance target that affects vesting, and that could be achieved after the requisite service period, be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award and compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved. The guidance will permit an entity to apply the amendments in the update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the consolidated financial statements and to all new or modified awards thereafter.

This guidance was effective for the first quarter of fiscal 2017 and did not have any impact on our consolidated financial statements as we currently do not have any share-based payment awards with terms of a performance target that affects vesting and could be achieved after the requisite service period.

Recently Issued Accounting Pronouncements

In May 2014, the FASB issued ASU No. 2014-09, which amends ASC Topic 606, Revenue from Contracts with Customers. The amendments in this ASU are intended to enhance the comparability of revenue recognition practices and will be applied to all contracts with customers. Improved disclosures related to the nature, amount, timing, and uncertainty of revenue that is recognized are requirements under the amended guidance. In April 2015, the FASB issued ASU 2015-24, Revenue from Contracts with Customers: Deferral of the Effective Date which proposed a deferral of the effective date by one year, and on July 7, 2015, the FASB decided to delay the effective date by one year. The deferral results in the new revenue standard being effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. We are therefore required to apply the new revenue guidance in our fiscal 2019 interim and annual financial statements. This ASU can be adopted either retrospectively or as a cumulative-effect adjustment as of the date of adoption. We are currently assessing the impact that this guidance will have on our consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which changed the measurement principle for inventory from the lower of cost or market to lower of cost and net realizable value. This ASU is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2016. We are therefore required to apply this guidance in our fiscal 2018 interim and annual financial statements. We are currently assessing the impact that this guidance will have on our consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which increases transparency and comparability among companies accounting for lease transactions. The most significant change of this update will require the recognition of lease assets and liabilities on the balance sheet for operating lease arrangements with lease terms greater than twelve months for lessees. This update will require a modified retrospective application which includes a number of optional practical expedients related to the identification and classification of leases commenced before the effective date. This ASU is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2018. We are therefore required to apply this guidance in our fiscal 2020 interim and annual financial statements. We are currently assessing the impact that this guidance will have on our consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Shares-Based Payment Accounting." ASU 2016-09 is intended to improve the accounting for share-based payment transactions as part of the FASB’s simplification initiative. ASU 2016-09 changes several aspects of the accounting for share-based payment award transactions, including: (1) accounting for income taxes; (2) classification of excess tax benefits on the statement of cash flows; (3) forfeitures; (4) minimum statutory tax withholding requirements; and (5) classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax-withholding purposes. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those years for public companies. We are therefore required to apply this guidance in our fiscal 2018 interim and annual financial statements. We are currently assessing the impact that ASU 2016-09 will have on its consolidated financial statements.

There are no other new accounting pronouncements that are expected to have a significant impact on our consolidated financial statements.