REVENUE RECOGNITION	12 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION The Company recognizes manufacturing revenue when it ships goods or the goods are received by its customer, title and risk of ownership have passed, the price to the buyer is fixed or determinable and recoverability is reasonably assured. Generally, there are no formal substantive customer acceptance requirements or further obligations related to manufacturing services. If such requirements or obligations exist, then the Company recognizes the related revenues at the time when such requirements are completed, and the obligations are fulfilled. Some of the Company's customer contracts allow the recovery of certain costs related to manufacturing services that are over and above the prices charged for the related products. The Company determines the amount of costs that are recoverable based on agreements with those customers. Also, certain customer contracts contain commitments and obligations that may result in additional expenses or decreases in revenue. The Company accrues for these commitments and obligations based on facts and circumstances including historical practice and contractual terms. Please see additional details in the customer contract section below. The Company also makes provisions for estimated sales returns at the time revenue is recognized based upon contractual terms and an analysis of historical returns and adjustments. Provisions for sales returns were not material to the consolidated financial statements for any of the periods presented. The Company provides a comprehensive suite of services for its customers that range from advanced product design to manufacturing and logistics to after-sales services. The Company recognizes service revenue when the services have been performed, and the related costs are expensed as incurred. Sales for services were less than 10% of the Company's total sales for all periods presented, and accordingly, are included in net sales in the consolidated statements of operations. The Company recognized research and development costs primarily related to its design and innovations businesses of $78.2 million, $65.6 million, and $61.0 million for the fiscal years ended March 31, 2018, 2017 and 2016, respectively. Transition to ASC 606 ASU 2014-09 “Revenue Contracts with Customers (Topic 606)” establishes a comprehensive framework for determining the nature, amount, timing and uncertainty of revenues and cash flows arising from a contract with a customer. Upon adoption of the new guidance, effective April 1, 2018 for Flex, the timing of revenue recognition for a portion of the Company’s business will change, resulting in the recognition of revenue for certain of the Company’s manufacturing services customer contracts earlier than under the previous recognition rules. Refer to note 2 for further detail about the impact to the Company upon adoption. Customer Contracts and Related Obligations The Company generally enters into master supply agreements (“MSA”) with its customers that provide the framework under which business will be conducted. This includes matters such as warranty, indemnification, transfer of title and risk of loss, liability for excess and obsolete inventory, pricing formulas, payment terms, etc. On occasion, the level of business under those agreements is not guaranteed. In those instances, we bid on a program-by-program basis and typically receive customer purchase orders for specific quantities and timing of products. As a result, the Company considers its contract with a customer to be the combination of the MSA and the purchase order, or any other similar documents such as a statement of work that embody the commitment by the customer. Certain of the Company’s customer agreements include terms that result in potential price adjustments. These price adjustments include, but are not limited to, sharing of cost savings, committed price reductions, material margins earned over the period that are contractually restricted to be paid to the customers, rebates, refunds tied to performance metrics such as on-time delivery, and other periodic pricing resets that may be refundable to customers. The Company accrues for these contractual provisions as a reduction of revenues when incurred which generally approximates the same time that revenue for the portion of the arrangement that is not subject to such price adjustments is recognized. The Company determines the amounts to be accrued based on the amount of potential refund required by the contract, where applicable, historical experience and other surrounding facts and circumstances. Often these obligations are settled with the customer in a period after shipment through various methods which include reduction of prices in future purchases, issuance of a payment to the customer, or issuance of a credit note applied against the customer’s accounts receivable balance. In some instances, the agreement might be silent on the settlement mechanism. Any difference between the amount accrued upon shipment for potential refunds and the actual amount agreed to with the customer is recorded as an increase or decrease in revenue. These potential price adjustments are included as part of other current liabilities on the consolidated balance sheet, and disclosed as part of customer related accruals in note 2. Refer to note 2 for further details about other current liabilities.

REVENUE RECOGNITION

The Company recognizes manufacturing revenue when it ships goods or the goods are received by its customer, title and risk of ownership have passed, the price to the buyer is fixed or determinable and recoverability is reasonably assured. Generally, there are no formal substantive customer acceptance requirements or further obligations related to manufacturing services. If such requirements or obligations exist, then the Company recognizes the related revenues at the time when such requirements are completed, and the obligations are fulfilled. Some of the Company's customer contracts allow the recovery of certain costs related to manufacturing services that are over and above the prices charged for the related products. The Company determines the amount of costs that are recoverable based on agreements with those customers. Also, certain customer contracts contain commitments and obligations that may result in additional expenses or decreases in revenue. The Company accrues for these commitments and obligations based on facts and circumstances including historical practice and contractual terms. Please see additional details in the customer contract section below. The Company also makes provisions for estimated sales returns at the time revenue is recognized based upon contractual terms and an analysis of historical returns and adjustments. Provisions for sales returns were not material to the consolidated financial statements for any of the periods presented.

The Company provides a comprehensive suite of services for its customers that range from advanced product design to manufacturing and logistics to after-sales services. The Company recognizes service revenue when the services have been performed, and the related costs are expensed as incurred. Sales for services were less than 10% of the Company's total sales for all periods presented, and accordingly, are included in net sales in the consolidated statements of operations. The Company recognized research and development costs primarily related to its design and innovations businesses of $78.2 million, $65.6 million, and $61.0 million for the fiscal years ended March 31, 2018, 2017 and 2016, respectively.

Transition to ASC 606

ASU 2014-09 “Revenue Contracts with Customers (Topic 606)” establishes a comprehensive framework for determining the nature, amount, timing and uncertainty of revenues and cash flows arising from a contract with a customer. Upon adoption of the new guidance, effective April 1, 2018 for Flex, the timing of revenue recognition for a portion of the Company’s business will change, resulting in the recognition of revenue for certain of the Company’s manufacturing services customer contracts earlier than under the previous recognition rules. Refer to note 2 for further detail about the impact to the Company upon adoption.

Customer Contracts and Related Obligations

The Company generally enters into master supply agreements (“MSA”) with its customers that provide the framework under which business will be conducted. This includes matters such as warranty, indemnification, transfer of title and risk of loss, liability for excess and obsolete inventory, pricing formulas, payment terms, etc. On occasion, the level of business under those agreements is not guaranteed. In those instances, we bid on a program-by-program basis and typically receive customer purchase orders for specific quantities and timing of products. As a result, the Company considers its contract with a customer to be the combination of the MSA and the purchase order, or any other similar documents such as a statement of work that embody the commitment by the customer.

Certain of the Company’s customer agreements include terms that result in potential price adjustments. These price adjustments include, but are not limited to, sharing of cost savings, committed price reductions, material margins earned over the period that are contractually restricted to be paid to the customers, rebates, refunds tied to performance metrics such as on-time delivery, and other periodic pricing resets that may be refundable to customers. The Company accrues for these contractual provisions as a reduction of revenues when incurred which generally approximates the same time that revenue for the portion of the arrangement that is not subject to such price adjustments is recognized. The Company determines the amounts to be accrued based on the amount of potential refund required by the contract, where applicable, historical experience and other surrounding facts and circumstances. Often these obligations are settled with the customer in a period after shipment through various methods which include reduction of prices in future purchases, issuance of a payment to the customer, or issuance of a credit note applied against the customer’s accounts receivable balance. In some instances, the agreement might be silent on the settlement mechanism. Any difference between the amount accrued upon shipment for potential refunds and the actual amount agreed to with the customer is recorded as an increase or decrease in revenue. These potential price adjustments are included as part of other current liabilities on the consolidated balance sheet, and disclosed as part of customer related accruals in note 2. Refer to note 2 for further details about other current liabilities.