Restatement - Schedule of Effects of Prior Period Errors on the Consolidated Financial Statements - Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Nov. 30, 2012
Current Assets
Cash and cash equivalents	$ 211.1	$ 243.3	$ 253.5	$ 215.7	$ 265.9	$ 154.9	$ 120.7	$ 144.1	$ 197.6	$ 162.1
Accounts receivable	171.5	189.3	175.6	190.0	170.5	200.5	177.3	186.1
Inventories	157.5	147.9	150.1	161.5	138.0	131.8	131.7	136.2
Recoverable from the U.S. government and other third parties for environmental remediation costs	24.0	23.2	23.7	23.5	19.4	20.1	21.0	22.4
Other current assets, net	61.5	63.3	49.0	43.7	38.6	30.1	24.5	28.6
Income taxes	2.9			2.3	2.1	13.7	11.8	11.8
Deferred income taxes	28.1	14.0	19.3	18.7	19.9	10.7	18.6	19.2
Total Current Assets	662.6	687.0	677.2	661.4	660.4	567.8	511.6	554.4
Noncurrent Assets
Property, plant and equipment, net	365.8	351.8	356.3	357.2	366.5	369.3	369.6	372.4
Real estate held for entitlement and leasing	86.2	84.2	82.9	81.5	94.4	87.3	83.2	81.2
Recoverable from the U.S. government and other third parties for environmental remediation costs	210.4	123.2	76.8	79.3	87.2	89.6	87.5	92.5
Deferred income taxes	286.7	254.6	247.3	256.0	261.4	182.5	180.2	185.6
Goodwill	158.1	158.1	158.1	158.1	158.1	158.1	158.1	153.1
Intangible assets	108.8	112.1	115.5	118.8	122.2	125.6	128.9	132.3
Income taxes	7.9				6.6
Assets held for sale				14.2		0.0
Other noncurrent assets, net	85.7	116.6	115.5	99.8	93.0	94.1	86.9	80.0
Total Noncurrent Assets	1,372.3	1,270.6	1,222.1	1,234.3	1,258.2	1,174.5	1,161.6	1,163.4
Total Assets	2,034.9	1,957.6	1,899.3	1,895.7	1,918.6	1,742.3	1,673.2	1,717.8
Current Liabilities
Short-term borrowings and current portion of long-term debt	5.3	5.3	5.3	5.3	5.3	5.5	4.2	3.0
Accounts payable	105.2	88.7	88.1	85.0	104.0	115.4	94.4	97.1
Reserves for environmental remediation costs	32.6	37.6	38.7	38.3	31.9	35.0	36.0	38.0
Postretirement medical and life insurance benefits	6.0	6.4	6.4	6.4	6.4	7.2	7.2	7.2
Advance payments on contracts	203.7	211.7	197.3	207.0	197.4	116.0	103.4	94.2
Other current liabilities	201.3	243.7	200.9	213.5	221.4	218.1	183.7	217.7
Total Current Liabilities	554.1	593.4	536.7	555.5	566.4	497.2	428.9	457.2
Noncurrent Liabilities
Senior debt	88.8	90.0	91.3	92.5	93.8	95.0	96.3	41.9
Second-priority senior notes	460.0	460.0	460.0	460.0	460.0	460.0	460.0	460.0
Convertible subordinated notes	84.8	84.8	98.0	99.4	133.8	133.6	143.0	188.7
Other debt	13.1	21.1	63.3	81.3	89.3	89.4	79.5	0.5
Reserves for environmental remediation costs	273.5	198.5	122.8	124.3	134.1	133.6	127.7	132.4
Pension benefits	566.2	471.9	475.5	479.1	482.8	257.7	262.1	266.5
Postretirement medical and life insurance benefits	45.5	49.4	50.1	50.6	51.7	57.1	57.5	58.5
Other noncurrent liabilities	94.4	97.8	99.7	81.8	80.6	79.3	78.3	76.5
Total Noncurrent Liabilities	1,626.3	1,473.5	1,460.7	1,469.0	1,526.1	1,305.7	1,304.4	1,225.0
Total Liabilities	$ 2,180.4	2,066.9	1,997.4	2,024.5	$ 2,092.5	1,802.9	1,733.3	1,682.2
Commitments and contingencies
Redeemable common stock, par value of $0.10; 0.1 million shares issued and outstanding as of November 30, 2015 and 2014	$ 0.9	0.1	0.1	0.1	$ 1.6	0.2	0.1	0.1
Stockholders’ Deficit
Preference stock	0.0				0.0
Common stock	6.5	6.4	6.3	6.3	5.9	5.9	5.9	5.9
Other capital	340.1	340.5	325.8	324.6	287.4	285.4	283.2	281.6
Treasury stock	(64.5)	(64.5)	(64.5)	(64.5)	(64.5)	(64.5)	(64.5)	(8.6)
Accumulated deficit	(86.8)	(94.5)	(56.6)	(73.9)	(70.6)	(82.5)	(72.0)	(22.8)
Accumulated other comprehensive loss, net of income taxes	(341.7)	(297.3)	(309.2)	(321.4)	(333.7)	(205.1)	(212.8)	(220.6)	(228.3)
Total Stockholders’ Deficit	(146.4)	(109.4)	(98.2)	(128.9)	(175.5)	(60.8)	(60.2)	35.5	37.3	(394.3)
Total liabilities, redeemable common stock, and stockholders’ (deficit) equity	2,034.9	1,957.6	1,899.3	1,895.7	1,918.6	1,742.3	1,673.2	1,717.8
Northrop [Member]
Current Assets
Receivable from Northrop	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0
Noncurrent Assets
Receivable from Northrop	$ 62.7	70.0	69.7	69.4	68.8	68.0	67.2	66.3
As Reported [Member]
Current Assets
Cash and cash equivalents		243.3	253.5	215.7	265.9	154.9	120.7	144.1	197.6	162.1
Accounts receivable		186.7	173.7	206.1	172.9	214.7	191.7	199.2
Inventories		148.7	150.3	161.4	139.0	132.3	131.9	139.2
Recoverable from the U.S. government and other third parties for environmental remediation costs		23.2	23.7	23.5	19.4	20.1	21.0	22.4
Other current assets, net		60.0	45.4	42.5	35.9	26.7	19.6	22.5
Income taxes				1.9	2.1	13.4	10.7	5.8
Deferred income taxes		19.4	24.8	22.5	25.3	4.0	16.2	18.6
Total Current Assets		687.3	677.4	679.6	666.5	572.1	517.8	557.8
Noncurrent Assets
Property, plant and equipment, net		351.8	356.3	358.8	367.5	370.6	370.6	372.7
Real estate held for entitlement and leasing		84.2	82.9	81.5	94.4	87.3	83.2	81.2
Recoverable from the U.S. government and other third parties for environmental remediation costs		123.2	76.8	79.3	81.2	83.6	81.5	86.5
Deferred income taxes		253.6	245.3	254.5	259.0	180.0	170.2	175.9
Goodwill		164.4	164.4	164.4	164.4	164.4	164.4	159.4
Intangible assets		112.1	115.5	118.8	122.2	125.6	128.9	132.3
Income taxes					0.0
Assets held for sale				14.2		0.0
Other noncurrent assets, net		110.8	109.8	91.2	91.6	92.1	85.8	76.5
Total Noncurrent Assets		1,270.1	1,220.7	1,232.1	1,255.1	1,177.6	1,157.8	1,156.8
Total Assets		1,957.4	1,898.1	1,911.7	1,921.6	1,749.7	1,675.6	1,714.6
Current Liabilities
Short-term borrowings and current portion of long-term debt		5.3	5.3	5.3	5.3	5.5	4.2	3.0
Accounts payable		88.7	87.6	84.5	103.5	115.4	94.5	98.0
Reserves for environmental remediation costs		37.6	38.7	38.3	31.9	35.0	36.0	38.0
Postretirement medical and life insurance benefits		6.4	6.4	6.4	6.4	7.2	7.2	7.2
Advance payments on contracts		211.7	197.3	224.0	198.5	122.4	110.5	95.2
Other current liabilities		241.3	198.5	211.3	221.7	216.4	178.7	212.1
Total Current Liabilities		591.0	533.8	569.8	567.3	501.9	431.1	453.5
Noncurrent Liabilities
Senior debt		90.0	91.3	92.5	93.8	95.0	96.3	41.9
Second-priority senior notes		460.0	460.0	460.0	460.0	460.0	460.0	460.0
Convertible subordinated notes		84.8	98.0	99.4	133.8	133.6	143.0	188.7
Other debt		21.1	63.3	81.3	89.3	89.4	79.5	0.5
Reserves for environmental remediation costs		198.5	122.8	124.3	134.1	133.6	127.7	132.4
Pension benefits		471.7	475.4	479.1	482.8	248.3	252.7	257.2
Postretirement medical and life insurance benefits		49.4	50.1	50.6	51.7	57.1	57.5	58.5
Other noncurrent liabilities		98.1	99.0	81.1	79.7	79.3	76.8	74.1
Total Noncurrent Liabilities		1,473.6	1,459.9	1,468.3	1,525.2	1,296.3	1,293.5	1,213.3
Total Liabilities		2,064.6	1,993.7	2,038.1	$ 2,092.5	1,798.2	1,724.6	1,666.8
Commitments and contingencies
Redeemable common stock, par value of $0.10; 0.1 million shares issued and outstanding as of November 30, 2015 and 2014		0.1	0.1	0.1	$ 1.6	0.2	0.1	0.1
Stockholders’ Deficit
Preference stock					0.0
Common stock		6.4	6.3	6.3	5.9	5.9	5.9	5.9
Other capital		339.6	324.8	324.6	287.3	285.4	283.0	281.4
Treasury stock		(64.5)	(64.5)	(64.5)	(64.5)	(64.5)	(64.5)	(8.6)
Accumulated deficit		(90.6)	(52.5)	(70.9)	(67.0)	(75.8)	(66.3)	(16.1)
Accumulated other comprehensive loss, net of income taxes		(298.2)	(309.8)	(322.0)	(334.2)	(199.7)	(207.2)	(214.9)
Total Stockholders’ Deficit		(107.3)	(95.7)	(126.5)	(172.5)	(48.7)	(49.1)	47.7
Total liabilities, redeemable common stock, and stockholders’ (deficit) equity		1,957.4	1,898.1	1,911.7	1,921.6	1,749.7	1,675.6	1,714.6
As Reported [Member] \| Northrop [Member]
Current Assets
Receivable from Northrop		6.0	6.0	6.0	6.0	6.0	6.0	6.0
Noncurrent Assets
Receivable from Northrop		70.0	69.7	69.4	74.8	74.0	73.2	72.3
Adjustments [Member]
Current Assets
Cash and cash equivalents		0.0	0.0	0.0	0.0	0.0	0.0	0.0	$ 0.0	$ 0.0
Accounts receivable		2.6	1.9	(16.1)	(2.4)	(14.2)	(14.4)	(13.1)
Inventories		(0.8)	(0.2)	0.1	(1.0)	(0.5)	(0.2)	(3.0)
Recoverable from the U.S. government and other third parties for environmental remediation costs		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Other current assets, net		3.3	3.6	1.2	2.7	3.4	4.9	6.1
Income taxes				0.4	0.0	0.3	1.1	6.0
Deferred income taxes		(5.4)	(5.5)	(3.8)	(5.4)	6.7	2.4	0.6
Total Current Assets		(0.3)	(0.2)	(18.2)	(6.1)	(4.3)	(6.2)	(3.4)
Noncurrent Assets
Property, plant and equipment, net		0.0	0.0	(1.6)	(1.0)	(1.3)	(1.0)	(0.3)
Real estate held for entitlement and leasing		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Recoverable from the U.S. government and other third parties for environmental remediation costs		0.0	0.0	0.0	6.0	6.0	6.0	6.0
Deferred income taxes		1.0	2.0	1.5	2.4	2.5	10.0	9.7
Goodwill		(6.3)	(6.3)	(6.3)	(6.3)	(6.3)	(6.3)	(6.3)
Intangible assets		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Income taxes					6.6
Assets held for sale				0.0		0.0
Other noncurrent assets, net		5.8	5.7	8.6	1.4	2.0	1.1	3.5
Total Noncurrent Assets		0.5	1.4	2.2	3.1	(3.1)	3.8	6.6
Total Assets		0.2	1.2	(16.0)	(3.0)	(7.4)	(2.4)	3.2
Current Liabilities
Short-term borrowings and current portion of long-term debt		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Accounts payable		0.0	0.5	0.5	0.5	0.0	(0.1)	(0.9)
Reserves for environmental remediation costs		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Postretirement medical and life insurance benefits		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Advance payments on contracts		0.0	0.0	(17.0)	(1.1)	(6.4)	(7.1)	(1.0)
Other current liabilities		2.4	2.4	2.2	(0.3)	1.7	5.0	5.6
Total Current Liabilities		2.4	2.9	(14.3)	(0.9)	(4.7)	(2.2)	3.7
Noncurrent Liabilities
Senior debt		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Second-priority senior notes		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Convertible subordinated notes		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Other debt		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Reserves for environmental remediation costs		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Pension benefits		0.2	0.1	0.0	0.0	9.4	9.4	9.3
Postretirement medical and life insurance benefits		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Other noncurrent liabilities		(0.3)	0.7	0.7	0.9	0.0	1.5	2.4
Total Noncurrent Liabilities		(0.1)	0.8	0.7	0.9	9.4	10.9	11.7
Total Liabilities		2.3	3.7	(13.6)	$ 0.0	4.7	8.7	15.4
Commitments and contingencies
Redeemable common stock, par value of $0.10; 0.1 million shares issued and outstanding as of November 30, 2015 and 2014		0.0	0.0	0.0	$ 0.0	0.0	0.0	0.0
Stockholders’ Deficit
Preference stock					0.0
Common stock		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Other capital		0.9	1.0	0.0	0.1	0.0	0.2	0.2
Treasury stock		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Accumulated deficit		(3.9)	(4.1)	(3.0)	(3.6)	(6.7)	(5.7)	(6.7)
Accumulated other comprehensive loss, net of income taxes		0.9	0.6	0.6	0.5	(5.4)	(5.6)	(5.7)
Total Stockholders’ Deficit		(2.1)	(2.5)	(2.4)	(3.0)	(12.1)	(11.1)	(12.2)
Total liabilities, redeemable common stock, and stockholders’ (deficit) equity		0.2	1.2	(16.0)	(3.0)	(7.4)	(2.4)	3.2
Adjustments [Member] \| Northrop [Member]
Current Assets
Receivable from Northrop		0.0	0.0	0.0	0.0	0.0	0.0	0.0
Noncurrent Assets
Receivable from Northrop		$ 0.0	$ 0.0	$ 0.0	$ (6.0)	$ (6.0)	$ (6.0)	$ (6.0)

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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