Derivative Instruments	6 Months Ended
Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments In the normal course of business, the Company is exposed to interest rate fluctuations. As part of its risk management strategy, the Company uses derivative instruments, primarily interest rate swaps, to hedge certain interest rate exposures. The Company’s objective is to add stability to interest expense and to manage its exposure to movements in market interest rates. The Company does not use derivative instruments for trading or any speculative purpose. As of September 30, 2019, the Company had interest rate swap agreements with a total notional amount of $1.60 billion. The Company initially accounted for all changes in fair value of its interest rate swaps on the statements of operations until designation as a cash flow hedge of interest rate risk on June 22, 2018. As a result, the Company recorded a gain of $5 million included in interest expense, net on the statement of operations for the six months ended September 30, 2018. Following the June 22, 2018 cash flow hedge designation, all changes in the hedging instruments’ fair value are recorded in accumulated other comprehensive loss (“AOCL”) and subsequently reclassified into earnings in the period during which the hedged transactions are recognized in earnings. The pre-tax impact of loss on derivatives designated for hedge accounting recognized in other comprehensive loss was $4 million ($3 million, net of tax) and $28 million ($21 million, net of tax) for the three and six months ended September 30, 2019, respectively. The pre-tax impact of income on derivatives designated for hedge accounting recognized in other comprehensive income was $8 million ($6 million, net of tax) and $7 million ($5 million, net of tax) for the three and six months ended September 30, 2018, respectively. We reclassified $2 million and $3 million from AOCL into earnings during the three and six months ended September 30, 2019, respectively. As of September 30, 2019, we expect amounts of approximately $18 million pertaining to cash flow hedges to be reclassified from AOCL into earnings over the next 12 months. All derivatives are recorded at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. As of September 30, 2019, the gross fair value of our derivative liabilities in interest rate swaps designated for hedge accounting is $55 million, of which $16 million is presented as other current liabilities and $39 million is presented as other liabilities on the balance sheet. As of March 31, 2019, the gross fair value of our derivative liabilities in interest rate swaps designated for hedge accounting was $26 million, of which $4 million is presented in other current liabilities and $22 million is presented in other liabilities on the balance sheet. The fair value of interest rate swaps is estimated based on valuation models that use interest rate yield curves as Level 2 inputs.

Derivative Instruments

In the normal course of business, the Company is exposed to interest rate fluctuations. As part of its risk management strategy, the Company uses derivative instruments, primarily interest rate swaps, to hedge certain interest rate exposures. The Company’s objective is to add stability to interest expense and to manage its exposure to movements in market interest rates. The Company does not use derivative instruments for trading or any speculative purpose.

As of September 30, 2019, the Company had interest rate swap agreements with a total notional amount of $1.60 billion. The Company initially accounted for all changes in fair value of its interest rate swaps on the statements of operations until designation as a cash flow hedge of interest rate risk on June 22, 2018. As a result, the Company recorded a gain of $5 million included in interest expense, net on the statement of operations for the six months ended September 30, 2018.

Following the June 22, 2018 cash flow hedge designation, all changes in the hedging instruments’ fair value are recorded in accumulated other comprehensive loss (“AOCL”) and subsequently reclassified into earnings in the period during which the hedged transactions are recognized in earnings. The pre-tax impact of loss on derivatives designated for hedge accounting recognized in other comprehensive loss was $4 million ($3 million, net of tax) and $28 million ($21 million, net of tax) for the three and six months ended September 30, 2019, respectively. The pre-tax impact of income on derivatives designated for hedge accounting recognized in other comprehensive income was $8 million ($6 million, net of tax) and $7 million ($5 million, net of tax) for the three and six months ended September 30, 2018, respectively. We reclassified $2 million and $3 million from AOCL into earnings during the three and six months ended September 30, 2019, respectively. As of September 30, 2019, we expect amounts of approximately $18 million pertaining to cash flow hedges to be reclassified from AOCL into earnings over the next 12 months.

All derivatives are recorded at fair value. The Company’s accounting treatment for these derivative instruments is based on its hedge designation. As of September 30, 2019, the gross fair value of our derivative liabilities in interest rate swaps designated for hedge accounting is $55 million, of which $16 million is presented as other current liabilities and $39 million is presented as other liabilities on the balance sheet. As of March 31, 2019, the gross fair value of our derivative liabilities in interest rate swaps designated for hedge accounting was $26 million, of which $4 million is presented in other current liabilities and $22 million is presented in other liabilities on the balance sheet. The fair value of interest rate swaps is estimated based on valuation models that use interest rate yield curves as Level 2 inputs.