Condensed Consolidating Financial Statements (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities:	$ 550,093	$ 532,394	$ 626,608
Purchases of AFS securities	0	0	(90,581)
Sales, maturities and payments received on AFS securities	1,144	436,471	91,878
Principal payments and sales of mortgage loans and real estate owned, net	207,174	38,481	32,090
Capital expenditures	(89,255)	(99,923)	(123,158)
Payments for business acquisitions, net of cash acquired	(54,816)	(88,776)	(113,252)
Franchise loans funded	(34,473)	(22,820)	(49,695)
Payments received on franchise loans	61,437	55,007	90,636
Intercompany borrowings (payments)			0
Other, net	8,108	11,075	13,150
Net cash provided by (used in) investing activities	99,319	329,515	(148,932)
Repayments of commercial paper and line of credit borrowings	(1,700,000)	(1,465,000)	(1,049,136)
Proceeds from line of credit borrowings	1,700,000	1,465,000	1,049,136
Repayments of long-term debt	0	0	(400,000)
Proceeds from issuance of long-term debt	0	996,831	0
Customer banking deposits, net	0	(326,705)	(28,544)
Transfer of bank deposits	0	(419,028)	0
Dividends paid	(187,115)	(201,688)	(219,960)
Repurchase of common stock, including shares surrendered	(322,850)	(2,018,338)	(10,449)
Proceeds from exercise of stock options	2,371	25,775	16,522
Intercompany borrowings (payments)		0	0
Other, net	(22,830)	(18,576)	(3,376)
Net cash used in financing activities	(530,424)	(1,961,729)	(645,807)
Effects of exchange rate changes on cash	(4,458)	(10,569)	(9,986)
Net increase (decrease) in cash and cash equivalents	114,530	(1,110,389)	(178,117)
Cash and cash equivalents at beginning of the year	896,801	2,007,190	2,185,307
Cash and cash equivalents at end of the year	1,011,331	896,801	2,007,190
H&R Block, Inc. (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities:			0
Purchases of AFS securities			0
Sales, maturities and payments received on AFS securities			0
Principal payments and sales of mortgage loans and real estate owned, net			0
Capital expenditures			0
Payments for business acquisitions, net of cash acquired			0
Franchise loans funded			0
Payments received on franchise loans			0
Intercompany borrowings (payments)			0
Other, net			0
Net cash provided by (used in) investing activities			0
Repayments of commercial paper and line of credit borrowings		0	0
Proceeds from line of credit borrowings		0	0
Repayments of long-term debt			0
Proceeds from issuance of long-term debt		0
Customer banking deposits, net		0	0
Transfer of bank deposits		0
Dividends paid	(187,115)	(201,688)	(219,960)
Repurchase of common stock, including shares surrendered	(322,850)	(2,018,338)	(10,449)
Proceeds from exercise of stock options	2,371	25,775	16,522
Intercompany borrowings (payments)	507,594	2,197,954	213,887
Other, net		(3,703)	0
Net cash used in financing activities		0	0
Effects of exchange rate changes on cash		0	0
Net increase (decrease) in cash and cash equivalents		0	0
Cash and cash equivalents at beginning of the year	0	0	0
Cash and cash equivalents at end of the year		0	0
Other Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities:	595,648	588,083	611,152
Purchases of AFS securities			(200)
Sales, maturities and payments received on AFS securities	1,000	6,011	3,956
Principal payments and sales of mortgage loans and real estate owned, net			0
Capital expenditures	(89,223)	(99,902)	(122,934)
Payments for business acquisitions, net of cash acquired	(54,816)	(88,776)	(113,252)
Franchise loans funded	(337)	(341)	(475)
Payments received on franchise loans	335	394	437
Intercompany borrowings (payments)	(507,594)	(2,197,954)	(285,049)
Other, net	6,562	8,883	9,343
Net cash provided by (used in) investing activities	(644,073)	(2,371,685)	(508,174)
Repayments of commercial paper and line of credit borrowings		0	0
Proceeds from line of credit borrowings		0	0
Repayments of long-term debt			0
Proceeds from issuance of long-term debt		0
Customer banking deposits, net		0	0
Transfer of bank deposits		0
Dividends paid		0	0
Repurchase of common stock, including shares surrendered		0	0
Proceeds from exercise of stock options		0	0
Intercompany borrowings (payments)	194,782	1,147,985	(134,094)
Other, net	(22,830)	4,409	(3,376)
Net cash used in financing activities	171,952	1,152,394	(137,470)
Effects of exchange rate changes on cash	(4,458)	(10,569)	(9,986)
Net increase (decrease) in cash and cash equivalents	119,069	(641,777)	(44,478)
Cash and cash equivalents at beginning of the year	887,776	1,529,553	1,574,031
Cash and cash equivalents at end of the year	1,006,845	887,776	1,529,553
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities:			0
Purchases of AFS securities			0
Sales, maturities and payments received on AFS securities			0
Principal payments and sales of mortgage loans and real estate owned, net			0
Capital expenditures			0
Payments for business acquisitions, net of cash acquired			0
Franchise loans funded			0
Payments received on franchise loans			0
Intercompany borrowings (payments)	702,376	3,345,939	150,955
Other, net			0
Net cash provided by (used in) investing activities	702,376	3,345,939	150,955
Repayments of commercial paper and line of credit borrowings		0	0
Proceeds from line of credit borrowings		0	0
Repayments of long-term debt			0
Proceeds from issuance of long-term debt		0
Customer banking deposits, net		440	660
Transfer of bank deposits		0
Dividends paid		0	0
Repurchase of common stock, including shares surrendered		0	0
Proceeds from exercise of stock options		0	0
Intercompany borrowings (payments)	(702,376)	(3,345,939)	(150,955)
Other, net		0	0
Net cash used in financing activities	(702,376)	(3,345,499)	(150,295)
Effects of exchange rate changes on cash		0	0
Net increase (decrease) in cash and cash equivalents		440	660
Cash and cash equivalents at beginning of the year	0	(440)	(1,100)
Cash and cash equivalents at end of the year	0	0	(440)
Block Financial (Issuer)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities:	(45,555)	(55,689)	15,456
Purchases of AFS securities			(90,381)
Sales, maturities and payments received on AFS securities	144	430,460	87,922
Principal payments and sales of mortgage loans and real estate owned, net	207,174	38,481	32,090
Capital expenditures	(32)	(21)	(224)
Payments for business acquisitions, net of cash acquired			0
Franchise loans funded	(34,136)	(22,479)	(49,220)
Payments received on franchise loans	61,102	54,613	90,199
Intercompany borrowings (payments)	(194,782)	(1,147,985)	134,094
Other, net	1,546	2,192	3,807
Net cash provided by (used in) investing activities	41,016	(644,739)	208,287
Repayments of commercial paper and line of credit borrowings	(1,700,000)	(1,465,000)	(1,049,136)
Proceeds from line of credit borrowings	1,700,000	1,465,000	1,049,136
Repayments of long-term debt			(400,000)
Proceeds from issuance of long-term debt		996,831
Customer banking deposits, net		(327,145)	(29,204)
Transfer of bank deposits		(419,028)
Dividends paid		0	0
Repurchase of common stock, including shares surrendered		0	0
Proceeds from exercise of stock options		0	0
Intercompany borrowings (payments)		0	71,162
Other, net		(19,282)	0
Net cash used in financing activities		231,376	(358,042)
Effects of exchange rate changes on cash		0	0
Net increase (decrease) in cash and cash equivalents	(4,539)	(469,052)	(134,299)
Cash and cash equivalents at beginning of the year	9,025	478,077	612,376
Cash and cash equivalents at end of the year	$ 4,486	$ 9,025	$ 478,077